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OpenAI: GPT-5.6 Sol

openai/gpt-5.6-sol

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GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series. It is suited for complex reasoning, coding, and agentic workflows, and is particularly strong at command-line and multi-step coding tasks and long-horizon problem solving.

Modalities
In / Out Price
50% off
$2 / $10per 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 Sol (Artificial Analysis and Vals AI)
SourceBenchmarkScore
Artificial AnalysisGPT-5.6 Sol (Xhigh) Intelligence Index44.0
Artificial AnalysisGPT-5.6 Sol (Xhigh) Coding Index78.3
Artificial AnalysisGPT-5.6 Sol (Xhigh) Agentic Index47.4
Artificial AnalysisGPT-5.6 Sol (Xhigh) GPQA Diamond93.1%
Artificial AnalysisGPT-5.6 Sol (Xhigh) HLE47.3%
Artificial AnalysisGPT-5.6 Sol (Xhigh) IFBench71.0%
Artificial AnalysisGPT-5.6 Sol (Xhigh) τ²-Bench Telecom84.8%
Artificial AnalysisGPT-5.6 Sol (Xhigh) AA-LCR82.3%
Artificial AnalysisGPT-5.6 Sol (Xhigh) τ-Bench Banking38.1%
Artificial AnalysisGPT-5.6 Sol (Xhigh) GDPval-AA53.6%
Artificial AnalysisGPT-5.6 Sol (Xhigh) CritPt28.6%
Artificial AnalysisGPT-5.6 Sol (Xhigh) SciCode57.1%
Artificial AnalysisGPT-5.6 Sol (Xhigh) Terminal-Bench Hard61.4%
Artificial AnalysisGPT-5.6 Sol (Xhigh) Terminal-Bench 4.024.7%
Artificial AnalysisGPT-5.6 Sol (Xhigh) Terminal-Bench 2.189.5%
Artificial AnalysisGPT-5.6 Sol (Xhigh) AA-Omniscience Accuracy58.8%
Artificial AnalysisGPT-5.6 Sol (Xhigh) AA-Omniscience Non-Hallucination Rate8.1%
Artificial AnalysisGPT-5.6 Sol (High) Intelligence Index42.3
Artificial AnalysisGPT-5.6 Sol (High) Coding Index77.2
Artificial AnalysisGPT-5.6 Sol (High) Agentic Index44.2
Artificial AnalysisGPT-5.6 Sol (High) GPQA Diamond92.8%
Artificial AnalysisGPT-5.6 Sol (High) HLE46.0%
Artificial AnalysisGPT-5.6 Sol (High) IFBench69.2%
Artificial AnalysisGPT-5.6 Sol (High) τ²-Bench Telecom83.3%
Artificial AnalysisGPT-5.6 Sol (High) AA-LCR81.7%
Artificial AnalysisGPT-5.6 Sol (High) τ-Bench Banking36.7%
Artificial AnalysisGPT-5.6 Sol (High) GDPval-AA50.2%
Artificial AnalysisGPT-5.6 Sol (High) CritPt25.7%
Artificial AnalysisGPT-5.6 Sol (High) SciCode57.8%
Artificial AnalysisGPT-5.6 Sol (High) Terminal-Bench Hard62.1%
Artificial AnalysisGPT-5.6 Sol (High) Terminal-Bench 4.020.7%
Artificial AnalysisGPT-5.6 Sol (High) Terminal-Bench 2.187.3%
Artificial AnalysisGPT-5.6 Sol (High) AA-Omniscience Accuracy58.4%
Artificial AnalysisGPT-5.6 Sol (High) AA-Omniscience Non-Hallucination Rate8.8%
Artificial AnalysisGPT-5.6 Sol (Max) Intelligence Index47.0
Artificial AnalysisGPT-5.6 Sol (Max) Coding Index77.4
Artificial AnalysisGPT-5.6 Sol (Max) Agentic Index50.2
Artificial AnalysisGPT-5.6 Sol (Max) GPQA Diamond94.1%
Artificial AnalysisGPT-5.6 Sol (Max) HLE49.5%
Artificial AnalysisGPT-5.6 Sol (Max) IFBench72.7%
Artificial AnalysisGPT-5.6 Sol (Max) τ²-Bench Telecom85.1%
Artificial AnalysisGPT-5.6 Sol (Max) AA-LCR84.0%
Artificial AnalysisGPT-5.6 Sol (Max) τ-Bench Banking44.3%
Artificial AnalysisGPT-5.6 Sol (Max) GDPval-AA55.6%
Artificial AnalysisGPT-5.6 Sol (Max) CritPt32.3%
Artificial AnalysisGPT-5.6 Sol (Max) SciCode57.1%
Artificial AnalysisGPT-5.6 Sol (Max) Terminal-Bench Hard65.9%
Artificial AnalysisGPT-5.6 Sol (Max) Terminal-Bench 4.039.9%
Artificial AnalysisGPT-5.6 Sol (Max) Terminal-Bench 2.188.0%
Artificial AnalysisGPT-5.6 Sol (Max) AA-Omniscience Accuracy59.4%
Artificial AnalysisGPT-5.6 Sol (Max) AA-Omniscience Non-Hallucination Rate7.8%
Artificial AnalysisGPT-5.6 Sol (Low) Intelligence Index33.5
Artificial AnalysisGPT-5.6 Sol (Low) Coding Index69.7
Artificial AnalysisGPT-5.6 Sol (Low) Agentic Index31.6
Artificial AnalysisGPT-5.6 Sol (Low) GPQA Diamond89.8%
Artificial AnalysisGPT-5.6 Sol (Low) HLE39.4%
Artificial AnalysisGPT-5.6 Sol (Low) IFBench66.5%
Artificial AnalysisGPT-5.6 Sol (Low) τ²-Bench Telecom76.0%
Artificial AnalysisGPT-5.6 Sol (Low) AA-LCR78.0%
Artificial AnalysisGPT-5.6 Sol (Low) τ-Bench Banking29.1%
Artificial AnalysisGPT-5.6 Sol (Low) GDPval-AA40.2%
Artificial AnalysisGPT-5.6 Sol (Low) CritPt14.9%
Artificial AnalysisGPT-5.6 Sol (Low) SciCode56.4%
Artificial AnalysisGPT-5.6 Sol (Low) Terminal-Bench Hard60.6%
Artificial AnalysisGPT-5.6 Sol (Low) Terminal-Bench 4.01.0%
Artificial AnalysisGPT-5.6 Sol (Low) Terminal-Bench 2.176.8%
Artificial AnalysisGPT-5.6 Sol (Low) AA-Omniscience Accuracy57.2%
Artificial AnalysisGPT-5.6 Sol (Low) AA-Omniscience Non-Hallucination Rate10.6%
Artificial AnalysisGPT-5.6 Sol (Medium) Intelligence Index39.2
Artificial AnalysisGPT-5.6 Sol (Medium) Coding Index76.3
Artificial AnalysisGPT-5.6 Sol (Medium) Agentic Index39.7
Artificial AnalysisGPT-5.6 Sol (Medium) GPQA Diamond92.6%
Artificial AnalysisGPT-5.6 Sol (Medium) HLE42.2%
Artificial AnalysisGPT-5.6 Sol (Medium) IFBench69.6%
Artificial AnalysisGPT-5.6 Sol (Medium) τ²-Bench Telecom81.0%
Artificial AnalysisGPT-5.6 Sol (Medium) AA-LCR80.3%
Artificial AnalysisGPT-5.6 Sol (Medium) τ-Bench Banking36.5%
Artificial AnalysisGPT-5.6 Sol (Medium) GDPval-AA46.1%
Artificial AnalysisGPT-5.6 Sol (Medium) CritPt22.9%
Artificial AnalysisGPT-5.6 Sol (Medium) SciCode57.4%
Artificial AnalysisGPT-5.6 Sol (Medium) Terminal-Bench Hard62.9%
Artificial AnalysisGPT-5.6 Sol (Medium) Terminal-Bench 4.014.6%
Artificial AnalysisGPT-5.6 Sol (Medium) Terminal-Bench 2.186.1%
Artificial AnalysisGPT-5.6 Sol (Medium) AA-Omniscience Accuracy57.8%
Artificial AnalysisGPT-5.6 Sol (Medium) AA-Omniscience Non-Hallucination Rate9.2%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) Intelligence Index28.3
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) Coding Index65.1
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) Agentic Index28.1
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) GPQA Diamond79.0%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) HLE16.7%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) AA-LCR62.3%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) τ-Bench Banking19.6%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) GDPval-AA37.1%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) CritPt5.1%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) SciCode47.7%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) Terminal-Bench 2.174.2%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) AA-Omniscience Accuracy48.7%
Artificial AnalysisGPT-5.6 Sol (Non-reasoning) AA-Omniscience Non-Hallucination Rate7.2%
Vals AIGPT-5.6 Sol Code Migration52.9%
Vals AIGPT-5.6 Sol CorpFin v264.4%
Vals AIGPT-5.6 Sol CyberBench v1.176.3%
Vals AIGPT-5.6 Sol EMB72.3%
Vals AIGPT-5.6 Sol Finance Agent (v2)53.8%
Vals AIGPT-5.6 Sol GPQA Diamond95.2%
Vals AIGPT-5.6 Sol Harvey's Legal Agent Benchmark2.5%
Vals AIGPT-5.6 Sol IOI91.2%
Vals AIGPT-5.6 Sol LiveCodeBench82.6%
Vals AIGPT-5.6 Sol LegalBench87.0%
Vals AIGPT-5.6 Sol Legal Research Bench48.1%
Vals AIGPT-5.6 Sol MedCode44.0%
Vals AIGPT-5.6 Sol MedScribe85.2%
Vals AIGPT-5.6 Sol MMLU Pro89.1%
Vals AIGPT-5.6 Sol MMMU Pro88.8%
Vals AIGPT-5.6 Sol MortgageTax67.3%
Vals AIGPT-5.6 Sol ProgramBench1.5%
Vals AIGPT-5.6 Sol ProofBench v1.183.0%
Vals AIGPT-5.6 Sol Vals RSI Index23.9%
Vals AIGPT-5.6 Sol SAGE52.6%
Vals AIGPT-5.6 Sol SkillsBench54.1%
Vals AIGPT-5.6 Sol SRE Bench30.5%
Vals AIGPT-5.6 Sol SWE-bench96.2%
Vals AIGPT-5.6 Sol Tax Agent Bench68.0%
Vals AIGPT-5.6 Sol TaxEval v274.8%
Vals AIGPT-5.6 Sol Terminal-Bench 4.037.9%
Vals AIGPT-5.6 Sol Vals Index58.0%
Vals AIGPT-5.6 Sol Vals Multimodal Index72.6%
Vals AIGPT-5.6 Sol Vibe Code Bench 1-10020.0%
Vals AIGPT-5.6 Sol Vibe Code Bench v1.180.5%
Vals AIGPT-5.6 Sol Web Search Index43.6%

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 Sol on OpenRouter.

  • GPT-5.6 Migration GuideCookbook

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Latency
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P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchAzure (EU)92.8%74.7%Amazon Bedrock92.6%74.7%OpenAI93.2%74.0%Azure (US)93.6%73.3%Azure92.9%72.7%auto-routing92.4%70.7%
Uptime (3d)The model was reachable. Request routed to a provider.
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Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
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Availability over the last 3 days

Last 72 hours
Availability 99.68%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.58%
Without Routing
98.82%

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 Sol is the flagship model in OpenAI's GPT-5.6 series. It is suited for complex reasoning, coding, and agentic workflows, and is particularly strong at command-line and multi-step coding tasks and long-horizon problem solving.

The GPT-5.6 Sol 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 Sol costs $2.00/M input tokens and $10.00/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 Sol has a 1,050,000 token context window. It supports up to 128,000 completion tokens.

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

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

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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

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

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

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