Skip to content
  • Models
  • Rankings
  • Ori
Sign Up
Sign Up
OpenRouterOpenRouter
© 2026 OpenRouter, Inc

Product

  • Chat
  • Rankings
  • Benchmarks
  • Apps
  • Discover
  • Models
  • Collections
  • Providers
  • Tools
  • Pricing
  • Business
  • Enterprise
  • Labs

Company

  • About
  • Blog
  • Careers
    Hiring
  • Privacy
  • Terms of Service
  • Trust Center
  • Support
  • Works With OR
  • Data
  • Brand

Developer

  • Documentation
  • API Reference
  • Developer Platform
  • Status
  • AI Site Map

Connect

  • Discord
  • GitHub
  • LinkedIn
  • X
  • YouTube
Favicon for openai

OpenAI: GPT-5.5

openai/gpt-5.5

Compare

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, enabling large-scale reasoning, coding, and multimodal workflows within a single system.

Modalities
In / Out Price
$5 / $30per 1M
Context
1.1M
Released
Apr 24, 2026
Knowledge Cutoff
Dec 2025
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityDocumentationFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for OpenAI: GPT-5.5 (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisGPT-5.5 (low) Coding Index60.9
Artificial AnalysisGPT-5.5 (low) GPQA Diamond91.0%
Artificial AnalysisGPT-5.5 (low) HLE32.7%
Artificial AnalysisGPT-5.5 (low) IFBench64.4%
Artificial AnalysisGPT-5.5 (low) τ²-Bench Telecom83.9%
Artificial AnalysisGPT-5.5 (low) AA-LCR81.0%
Artificial AnalysisGPT-5.5 (low) GDPval-AA26.6%
Artificial AnalysisGPT-5.5 (low) CritPt8.0%
Artificial AnalysisGPT-5.5 (low) Terminal-Bench Hard52.3%
Artificial AnalysisGPT-5.5 (low) AA-Omniscience Accuracy54.8%
Artificial AnalysisGPT-5.5 (low) AA-Omniscience Non-Hallucination Rate12.0%
Artificial AnalysisGPT-5.5 (Non-reasoning) Coding Index56.5
Artificial AnalysisGPT-5.5 (Non-reasoning) GPQA Diamond76.8%
Artificial AnalysisGPT-5.5 (Non-reasoning) HLE13.7%
Artificial AnalysisGPT-5.5 (Non-reasoning) IFBench46.1%
Artificial AnalysisGPT-5.5 (Non-reasoning) τ²-Bench Telecom69.3%
Artificial AnalysisGPT-5.5 (Non-reasoning) AA-LCR64.0%
Artificial AnalysisGPT-5.5 (Non-reasoning) GDPval-AA22.9%
Artificial AnalysisGPT-5.5 (Non-reasoning) CritPt1.4%
Artificial AnalysisGPT-5.5 (Non-reasoning) Terminal-Bench Hard49.2%
Artificial AnalysisGPT-5.5 (Non-reasoning) AA-Omniscience Accuracy45.6%
Artificial AnalysisGPT-5.5 (Non-reasoning) AA-Omniscience Non-Hallucination Rate7.3%
Artificial AnalysisGPT-5.5 (high) Intelligence Index37.0
Artificial AnalysisGPT-5.5 (high) Coding Index71.6
Artificial AnalysisGPT-5.5 (high) Agentic Index34.3
Artificial AnalysisGPT-5.5 (high) GPQA Diamond93.2%
Artificial AnalysisGPT-5.5 (high) HLE45.0%
Artificial AnalysisGPT-5.5 (high) IFBench71.6%
Artificial AnalysisGPT-5.5 (high) τ²-Bench Telecom93.0%
Artificial AnalysisGPT-5.5 (high) AA-LCR84.3%
Artificial AnalysisGPT-5.5 (high) GDPval-AA40.9%
Artificial AnalysisGPT-5.5 (high) CritPt25.4%
Artificial AnalysisGPT-5.5 (high) SciCode56.1%
Artificial AnalysisGPT-5.5 (high) Terminal-Bench Hard59.8%
Artificial AnalysisGPT-5.5 (high) AA-Omniscience Accuracy57.0%
Artificial AnalysisGPT-5.5 (high) AA-Omniscience Non-Hallucination Rate10.9%
Artificial AnalysisGPT-5.5 (medium) Intelligence Index33.8
Artificial AnalysisGPT-5.5 (medium) Coding Index71.5
Artificial AnalysisGPT-5.5 (medium) Agentic Index29.5
Artificial AnalysisGPT-5.5 (medium) GPQA Diamond92.6%
Artificial AnalysisGPT-5.5 (medium) HLE42.4%
Artificial AnalysisGPT-5.5 (medium) IFBench71.0%
Artificial AnalysisGPT-5.5 (medium) τ²-Bench Telecom91.8%
Artificial AnalysisGPT-5.5 (medium) AA-LCR83.0%
Artificial AnalysisGPT-5.5 (medium) GDPval-AA35.9%
Artificial AnalysisGPT-5.5 (medium) CritPt18.6%
Artificial AnalysisGPT-5.5 (medium) SciCode54.5%
Artificial AnalysisGPT-5.5 (medium) Terminal-Bench Hard57.6%
Artificial AnalysisGPT-5.5 (medium) AA-Omniscience Accuracy56.8%
Artificial AnalysisGPT-5.5 (medium) AA-Omniscience Non-Hallucination Rate10.4%
Artificial AnalysisGPT-5.5 (xhigh) Intelligence Index38.4
Artificial AnalysisGPT-5.5 (xhigh) Coding Index74.9
Artificial AnalysisGPT-5.5 (xhigh) Agentic Index36.4
Artificial AnalysisGPT-5.5 (xhigh) GPQA Diamond93.5%
Artificial AnalysisGPT-5.5 (xhigh) HLE45.8%
Artificial AnalysisGPT-5.5 (xhigh) IFBench75.9%
Artificial AnalysisGPT-5.5 (xhigh) τ²-Bench Telecom93.9%
Artificial AnalysisGPT-5.5 (xhigh) AA-LCR84.3%
Artificial AnalysisGPT-5.5 (xhigh) GDPval-AA41.8%
Artificial AnalysisGPT-5.5 (xhigh) CritPt27.1%
Artificial AnalysisGPT-5.5 (xhigh) SciCode55.8%
Artificial AnalysisGPT-5.5 (xhigh) Terminal-Bench Hard60.6%
Artificial AnalysisGPT-5.5 (xhigh) AA-Omniscience Accuracy58.0%
Artificial AnalysisGPT-5.5 (xhigh) AA-Omniscience Non-Hallucination Rate11.0%
Design ArenaGPT-5.5 Agents Arena Agenticgamedev Elo1181
Design ArenaGPT-5.5 Agents Arena Agentichtmlslides Elo1084
Design ArenaGPT-5.5 Agents Arena Agenticslides Elo1150
Design ArenaGPT-5.5 Agents Arena Agenticslides(Html) Elo1077
Design ArenaGPT-5.5 Agents Arena Agenticslides(Python-Pptx) Elo1155
Design ArenaGPT-5.5 Agents Arena Androidnative Elo1179
Design ArenaGPT-5.5 Agents Arena Full Stack Elo1099
Design ArenaGPT-5.5 Agents Arena Godotgamedev Elo1178
Design ArenaGPT-5.5 Agents Arena Htmlslides Elo1069
Design ArenaGPT-5.5 Agents Arena Mobile Apps Elo1139
Design ArenaGPT-5.5 Agents Arena Pptxslides Elo1157
Design ArenaGPT-5.5 Agents Arena Python-Pptxslides Elo1152
Design ArenaGPT-5.5 Agents Arena Python-Pptxslides Elo1114
Design ArenaGPT-5.5 Agents Arena Webapps Elo1128
Design ArenaGPT-5.5 Models Arena 3D Elo1214
Design ArenaGPT-5.5 Models Arena Asciiart Elo1272
Design ArenaGPT-5.5 Models Arena Code Categories Elo1269
Design ArenaGPT-5.5 Models Arena Data Visualization Elo1272
Design ArenaGPT-5.5 Models Arena Game Development Elo1308
Design ArenaGPT-5.5 Models Arena SVG Elo1236
Design ArenaGPT-5.5 Models Arena UI Component Elo1267
Design ArenaGPT-5.5 Models Arena Website Elo1265

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Documentation

Guides, cookbooks, and tools for building with OpenAI: GPT-5.5 on OpenRouter.

  • GPT-5.4 Migration GuideCookbook

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
$5.00$30.00$0.507.61s33 tps
99.97%
$5.00$30.00$0.502.53s47 tps
100.00%
Not used in Standard routing:Why these endpoints are not used
Flex
$2.50$15.00$0.253.93s88 tps
100.00%
$5.50$33.00$0.556.11s35 tps
100.00%
$5.50$33.00$0.55----
100.00%
$5.50$33.00$0.551.67s92 tps
--
Fast
$12.50$75.00$1.253.40s71 tps
100.00%
Throughput
92tok/s

P50, best across providers

Latency
1.67s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchAzure (US)93.8%77.3%Azure93.4%75.3%Amazon Bedrock93.1%75.3%auto-routing94.3%72.7%Azure (EU)93.8%71.3%OpenAI93.1%68.0%
Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.75%

Availability over the last 3 days

Last 72 hours
Availability 99.75%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.61%
Without Routing
99.08%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

1.
Favicon for https://nousresearch.com
Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
35.6Btokens
2.
Favicon for https://www.framer.com/
Framer
Create a professional website with Framer’s no-code AI website builder. Design freely, manage CMS content, optimize SEO, collaborate, and publish fast.
29.4Btokens
3.
Favicon for https://openai.com/codex
Codex
A coding agent that helps you build and ship with AI
8.03Btokens
4.
Favicon for https://openclaw.ai/
OpenClaw
OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.
7.25Btokens
5.
Favicon for https://omp.sh/
omp
new
6.82Btokens

Frequently asked questions

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, enabling large-scale reasoning, coding, and multimodal workflows within a single system.

The GPT-5.5 documentation on OpenRouter includes the GPT-5.4 Migration Guide cookbook. The quickstart covers API keys and your first request, and the API reference lists every parameter.

GPT-5.5 costs $5.00/M input tokens and $30.00/M output tokens, with separate rates for Cache Read at $0.50/M tokens and Web Search at $10.00/1K calls.

GPT-5.5 has a 1,050,000 token context window. It supports up to 128,000 completion tokens.

Yes. GPT-5.5 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

GPT-5.5 accepts files such as PDFs, images, and text as input and returns text.

GPT-5.5 is served by 3 providers on OpenRouter: OpenAI, Azure, and Amazon Bedrock. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

GPT-5.5 was released on April 24, 2026. Its knowledge cutoff is December 1, 2025.

More models from OpenAI

GPT-6.1 Sol Pro

GPT-6.1 Sol Pro is the same underlying model as GPT-6.1 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6.1 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6.1 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$2 / $10
GPT-6.1 Sol Pro

GPT-6.1 Sol Pro is the same underlying model as GPT-6.1 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6.1 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6.1 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$1 / $5
GPT-6.1 Sol

GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. It is suited for agentic coding, computer use, document-heavy professional work, and multi-step business workflow automation, and approaches Astra-level results on these tasks at a much lower cost. Compared with GPT-6 Sol, it makes fewer factual errors and is more reliable at respecting explicit restrictions and user intent during agentic tasks.

Text1.1M context$2 / $10
GPT-6.1 Sol

GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. It is suited for agentic coding, computer use, document-heavy professional work, and multi-step business workflow automation, and approaches Astra-level results on these tasks at a much lower cost. Compared with GPT-6 Sol, it makes fewer factual errors and is more reliable at respecting explicit restrictions and user intent during agentic tasks.

Text1.1M context$1 / $5
GPT-6 Luna Pro

GPT-6 Luna Pro is the same underlying model as GPT-6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Luna and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Luna instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$0.10 / $0.50
GPT-6 Luna Pro

GPT-6 Luna Pro is the same underlying model as GPT-6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Luna and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Luna instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$0.05 / $0.25
GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style.

Text1.1M context$0.10 / $0.50
GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style.

Text1.1M context$0.05 / $0.25
GPT-6 Sol Pro

GPT-6 Sol Pro is the same underlying model as GPT-6 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$2 / $10
GPT-6 Sol Pro

GPT-6 Sol Pro is the same underlying model as GPT-6 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$1 / $5
GPT-6 Sol

GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, agentic coding, business workflow automation, and computer use, and is particularly strong at long-horizon software engineering tasks in real codebases. It approaches Astra-level factual reliability at a much lower cost and shares Astra's clearer, more concise communication style in technical and coding conversations.

Text1.1M context$2 / $10
GPT-6 Sol

GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, agentic coding, business workflow automation, and computer use, and is particularly strong at long-horizon software engineering tasks in real codebases. It approaches Astra-level factual reliability at a much lower cost and shares Astra's clearer, more concise communication style in technical and coding conversations.

Text1.1M context$1 / $5
GPT Astra Latest

This model always redirects to the latest model in the GPT Astra family.

Text1.1M context
GPT Sol Latest

This model always redirects to the latest model in the GPT Sol family.

Text1.1M context
GPT Terra Latest

This model always redirects to the latest model in the GPT Terra family.

Text1.1M context
GPT Luna Latest

This model always redirects to the latest model in the GPT Luna family.

Text1.1M context
GPT Image 2.5 Sunburst

GPT Image 2.5 Sunburst is an image generation and editing model from OpenAI, positioned as the precision-oriented tier of the GPT Image 2.5 series. It is suited to detailed creative work where editing accuracy matters more than generation speed, via the dedicated Images API.

Image$8 / $30
GPT Image 2.5 Flare

GPT Image 2.5 Flare is an image generation and editing model from OpenAI, positioned as the speed-oriented tier of the GPT Image 2.5 series. It is suited to high-volume everyday generation, creator content, and rapid prototyping via the dedicated Images API.

Image$8 / $30
GPT-6 Astra

GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon agentic tasks that involve computer and browser use.

Text1.1M context$10 / $50
GPT-6 Astra

GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon agentic tasks that involve computer and browser use.

Text1.1M context$5 / $25