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OpenAI: GPT-5.6 Terra

openai/gpt-5.6-terra

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GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic tasks where capability and cost need to be balanced, offering strong performance at roughly half the cost of Sol.

Modalities
In / Out Price
$2 / $12per 1M
Context
1.1M
Released
Jul 9, 2026
Knowledge Cutoff
Feb 2026
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-5.6 Terra (Artificial Analysis)
SourceBenchmarkScore
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) Intelligence Index20.8
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) Coding Index52.3
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) Agentic Index23.5
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) GPQA Diamond74.6%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) HLE11.4%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) AA-LCR58.7%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) GDPval-AA29.2%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) CritPt2.0%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) SciCode45.1%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) AA-Omniscience Accuracy36.8%
Artificial AnalysisGPT-5.6 Terra (Non-reasoning) AA-Omniscience Non-Hallucination Rate5.0%
Artificial AnalysisGPT-5.6 Terra (xhigh) Intelligence Index38.0
Artificial AnalysisGPT-5.6 Terra (xhigh) Coding Index70.6
Artificial AnalysisGPT-5.6 Terra (xhigh) Agentic Index41.4
Artificial AnalysisGPT-5.6 Terra (xhigh) GPQA Diamond90.8%
Artificial AnalysisGPT-5.6 Terra (xhigh) HLE41.9%
Artificial AnalysisGPT-5.6 Terra (xhigh) IFBench66.3%
Artificial AnalysisGPT-5.6 Terra (xhigh) τ²-Bench Telecom80.4%
Artificial AnalysisGPT-5.6 Terra (xhigh) AA-LCR79.0%
Artificial AnalysisGPT-5.6 Terra (xhigh) GDPval-AA46.4%
Artificial AnalysisGPT-5.6 Terra (xhigh) CritPt27.1%
Artificial AnalysisGPT-5.6 Terra (xhigh) SciCode52.3%
Artificial AnalysisGPT-5.6 Terra (xhigh) Terminal-Bench Hard62.9%
Artificial AnalysisGPT-5.6 Terra (xhigh) AA-Omniscience Accuracy45.5%
Artificial AnalysisGPT-5.6 Terra (xhigh) AA-Omniscience Non-Hallucination Rate11.0%
Artificial AnalysisGPT-5.6 Terra (medium) Intelligence Index30.1
Artificial AnalysisGPT-5.6 Terra (medium) Coding Index64.7
Artificial AnalysisGPT-5.6 Terra (medium) Agentic Index30.4
Artificial AnalysisGPT-5.6 Terra (medium) GPQA Diamond87.2%
Artificial AnalysisGPT-5.6 Terra (medium) HLE33.3%
Artificial AnalysisGPT-5.6 Terra (medium) IFBench62.2%
Artificial AnalysisGPT-5.6 Terra (medium) τ²-Bench Telecom72.8%
Artificial AnalysisGPT-5.6 Terra (medium) AA-LCR74.0%
Artificial AnalysisGPT-5.6 Terra (medium) GDPval-AA37.7%
Artificial AnalysisGPT-5.6 Terra (medium) CritPt17.4%
Artificial AnalysisGPT-5.6 Terra (medium) SciCode50.5%
Artificial AnalysisGPT-5.6 Terra (medium) AA-Omniscience Accuracy44.6%
Artificial AnalysisGPT-5.6 Terra (medium) AA-Omniscience Non-Hallucination Rate10.2%
Artificial AnalysisGPT-5.6 Terra (max) Intelligence Index42.1
Artificial AnalysisGPT-5.6 Terra (max) Coding Index76.7
Artificial AnalysisGPT-5.6 Terra (max) Agentic Index43.2
Artificial AnalysisGPT-5.6 Terra (max) GPQA Diamond92.5%
Artificial AnalysisGPT-5.6 Terra (max) HLE42.9%
Artificial AnalysisGPT-5.6 Terra (max) IFBench71.2%
Artificial AnalysisGPT-5.6 Terra (max) τ²-Bench Telecom86.3%
Artificial AnalysisGPT-5.6 Terra (max) AA-LCR83.0%
Artificial AnalysisGPT-5.6 Terra (max) GDPval-AA46.6%
Artificial AnalysisGPT-5.6 Terra (max) CritPt30.0%
Artificial AnalysisGPT-5.6 Terra (max) SciCode55.0%
Artificial AnalysisGPT-5.6 Terra (max) Terminal-Bench Hard57.6%
Artificial AnalysisGPT-5.6 Terra (max) AA-Omniscience Accuracy46.8%
Artificial AnalysisGPT-5.6 Terra (max) AA-Omniscience Non-Hallucination Rate12.1%
Artificial AnalysisGPT-5.6 Terra (low) Intelligence Index27.5
Artificial AnalysisGPT-5.6 Terra (low) Coding Index58.1
Artificial AnalysisGPT-5.6 Terra (low) Agentic Index25.9
Artificial AnalysisGPT-5.6 Terra (low) GPQA Diamond84.3%
Artificial AnalysisGPT-5.6 Terra (low) HLE29.2%
Artificial AnalysisGPT-5.6 Terra (low) IFBench59.7%
Artificial AnalysisGPT-5.6 Terra (low) τ²-Bench Telecom60.5%
Artificial AnalysisGPT-5.6 Terra (low) AA-LCR71.3%
Artificial AnalysisGPT-5.6 Terra (low) GDPval-AA29.8%
Artificial AnalysisGPT-5.6 Terra (low) CritPt9.4%
Artificial AnalysisGPT-5.6 Terra (low) SciCode49.9%
Artificial AnalysisGPT-5.6 Terra (low) Terminal-Bench Hard43.9%
Artificial AnalysisGPT-5.6 Terra (low) AA-Omniscience Accuracy43.7%
Artificial AnalysisGPT-5.6 Terra (low) AA-Omniscience Non-Hallucination Rate10.1%
Artificial AnalysisGPT-5.6 Terra (high) Intelligence Index34.2
Artificial AnalysisGPT-5.6 Terra (high) Coding Index67.1
Artificial AnalysisGPT-5.6 Terra (high) Agentic Index36.7
Artificial AnalysisGPT-5.6 Terra (high) GPQA Diamond89.6%
Artificial AnalysisGPT-5.6 Terra (high) HLE38.5%
Artificial AnalysisGPT-5.6 Terra (high) IFBench64.4%
Artificial AnalysisGPT-5.6 Terra (high) τ²-Bench Telecom78.4%
Artificial AnalysisGPT-5.6 Terra (high) AA-LCR77.7%
Artificial AnalysisGPT-5.6 Terra (high) GDPval-AA43.1%
Artificial AnalysisGPT-5.6 Terra (high) CritPt22.9%
Artificial AnalysisGPT-5.6 Terra (high) SciCode52.4%
Artificial AnalysisGPT-5.6 Terra (high) Terminal-Bench Hard57.6%
Artificial AnalysisGPT-5.6 Terra (high) AA-Omniscience Accuracy45.5%
Artificial AnalysisGPT-5.6 Terra (high) AA-Omniscience Non-Hallucination Rate10.2%

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-5.6 Terra on OpenRouter.

  • GPT-5.6 Migration GuideCookbook

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AutoExacto benchmarks
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Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.66%

Availability over the last 3 days

Last 72 hours
Availability 99.66%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.62%
Without Routing
98.97%

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.

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Frequently asked questions

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic tasks where capability and cost need to be balanced, offering strong performance at roughly half the cost of Sol.

The GPT-5.6 Terra documentation on OpenRouter includes the GPT-5.6 Migration Guide cookbook. The quickstart covers API keys and your first request, and the API reference lists every parameter.

GPT-5.6 Terra costs $2.00/M input tokens and $12.00/M output tokens, with separate rates for Cache Read at $0.20/M tokens, Cache Write at $2.50/M tokens, and Web Search at $10.00/1K calls.

GPT-5.6 Terra has a 1,050,000 token context window. It supports up to 128,000 completion tokens.

Yes. GPT-5.6 Terra accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Yes. OpenAI caches prompts of 1024 tokens or more automatically, and GPT-5.6 Terra bills a cache write on each cached prompt whether or not the cached prefix is read again. To turn caching off for a request, set prompt_cache_options.mode to "explicit" at the request root and do not mark any content block with prompt_cache_breakpoint. Explicit mode disables OpenAI-managed breakpoints, so a request with none of your own has no cacheable prefix and is billed at the plain input rate. See the prompt caching guide.

GPT-5.6 Terra accepts files such as PDFs, images, and text as input and returns text.

GPT-5.6 Terra 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-5.6 Terra was released on July 9, 2026. Its knowledge cutoff is February 16, 2026.

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

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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.

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