Where is the GPT-5.6 Sol documentation?

The GPT-5.6 Sol documentation on OpenRouter includes the GPT-5.6 Migration Guide cookbook and the GPT 5.6 Discounts & Jevons Paradox blog post. The quickstart covers API keys and your first request, and the API reference lists every parameter.

How much does GPT-5.6 Sol cost?

GPT-5.6 Sol costs $4.00/M input tokens and $20.00/M output tokens, with separate rates for Cache Read at $0.40/M tokens and Cache Write at $5.00/M tokens.

What is the context length of GPT-5.6 Sol?

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

Does GPT-5.6 Sol support tool calling and structured outputs?

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.

Can I disable prompt caching for GPT-5.6 Sol?

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.

What inputs and outputs does GPT-5.6 Sol support?

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

Which providers serve GPT-5.6 Sol?

GPT-5.6 Sol is served by 3 providers on OpenRouter: OpenAI, Amazon Bedrock, and Azure. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was GPT-5.6 Sol released?

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

OpenAI: GPT-5.6 Sol

openai/gpt-5.6-sol

Compare

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

$4 / $20per 1M

Context

1.1M

Released

Jul 9, 2026

Knowledge cutoff

Feb 2026

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), or Floor (cheapest).

Latency / throughput


	$4.00	$20.00	$0.40	2.73s	75 tok/s	100.00%
	$4.00	$20.00	$0.40	4.74s	49 tok/s	94.90%
	$4.00	$20.00	$0.40	2.57s	85 tok/s	99.92%
Not used in Standard routing:Why these endpoints are not used
Flex	$2.00	$10.00	$0.20	4.50s	137 tok/s	99.24%
	$4.40	$22.00	$0.44	2.83s	84 tok/s	100.00%
	$4.40	$22.00	$0.44	--	--	100.00%
	$4.40	$22.00	$0.44	2.52s	47 tok/s	100.00%
Fast	$8.00	$40.00	$0.80	1.79s	65 tok/s	100.00%

Input $4.00Output $20.00
75 tok/s100.00% uptime
Input $4.00Output $20.00
49 tok/s94.90% uptime
Input $4.00Output $20.00
85 tok/s99.92% uptime
Not used in Standard routing:Why these endpoints are not used
Input $2.00Output $10.00
Flex
137 tok/s99.24% uptime
Input $4.40Output $22.00
84 tok/s100.00% uptime
Input $4.40Output $22.00
-- tok/s100.00% uptime
Input $4.40Output $22.00
47 tok/s100.00% uptime
Input $8.00Output $40.00
Fast
65 tok/s100.00% uptime

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.

Weighted average

Input

$1.241/M tokens

Output

$19.98/M tokens

GPT-5.6 Sol — Price history

Price history

No effective price data for this selection

		$1.016	$20.00	86.6%	43.5%
		$1.048	$21.13	89.3%	2.9%
		$1.527	$20.08	78.5%	42.5%
Not used in Standard routing:Why these endpoints are not used
		$0.620	$22.00	96.4%	0.1%
		$0.634	$22.31	97.0%	2.7%
		$1.116	$22.00	86.6%	6.8%
	Flex	$1.589	$10.01	40.3%	1.4%
	Fast	$3.009	$40.00	76.0%	0.1%

Effective in $1.016Effective out $20.00
Token share
43.5%
Effective in $1.048Effective out $21.13
Token share
2.9%
Effective in $1.527Effective out $20.08
Token share
42.5%
Not used in Standard routing:Why these endpoints are not used
Effective in $0.620Effective out $22.00
Token share
0.1%
Effective in $0.634Effective out $22.31
Token share
2.7%
Effective in $1.116Effective out $22.00
Token share
6.8%
Effective in $1.589Effective out $10.01
FlexToken share
1.4%
Effective in $3.009Effective out $40.00
FastToken share
0.1%

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.

Uptime (3d)

100.00%

Availability (3d)

92.70%

Availability over the last 3 days

Last 72 hours

Availability 92.70%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

94.88%

Without Routing

94.75%

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 provider routing options.

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)
Source	Benchmark	Score
Artificial Analysis	GPT-5.6 Sol (Low) Coding Index	69.7
Artificial Analysis	GPT-5.6 Sol (Low) Agentic Index	31.6
Artificial Analysis	GPT-5.6 Sol (Low) GPQA Diamond	89.8%
Artificial Analysis	GPT-5.6 Sol (Low) HLE	39.4%
Artificial Analysis	GPT-5.6 Sol (Low) IFBench	66.5%
Artificial Analysis	GPT-5.6 Sol (Low) τ²-Bench Telecom	76.0%
Artificial Analysis	GPT-5.6 Sol (Low) AA-LCR	78.0%
Artificial Analysis	GPT-5.6 Sol (Low) τ-Bench Banking	29.1%
Artificial Analysis	GPT-5.6 Sol (Low) GDPval-AA	40.7%
Artificial Analysis	GPT-5.6 Sol (Low) CritPt	14.9%
Artificial Analysis	GPT-5.6 Sol (Low) SciCode	56.4%
Artificial Analysis	GPT-5.6 Sol (Low) Terminal-Bench Hard	60.6%
Artificial Analysis	GPT-5.6 Sol (Low) Terminal-Bench 4.0	1.0%
Artificial Analysis	GPT-5.6 Sol (Low) Terminal-Bench 2.1	76.8%
Artificial Analysis	GPT-5.6 Sol (Xhigh) Coding Index	78.3
Artificial Analysis	GPT-5.6 Sol (Xhigh) Agentic Index	47.4
Artificial Analysis	GPT-5.6 Sol (Xhigh) GPQA Diamond	93.1%
Artificial Analysis	GPT-5.6 Sol (Xhigh) HLE	47.3%
Artificial Analysis	GPT-5.6 Sol (Xhigh) IFBench	71.0%
Artificial Analysis	GPT-5.6 Sol (Xhigh) τ²-Bench Telecom	84.8%
Artificial Analysis	GPT-5.6 Sol (Xhigh) AA-LCR	82.3%
Artificial Analysis	GPT-5.6 Sol (Xhigh) τ-Bench Banking	38.1%
Artificial Analysis	GPT-5.6 Sol (Xhigh) GDPval-AA	53.9%
Artificial Analysis	GPT-5.6 Sol (Xhigh) CritPt	28.6%
Artificial Analysis	GPT-5.6 Sol (Xhigh) SciCode	57.1%
Artificial Analysis	GPT-5.6 Sol (Xhigh) Terminal-Bench Hard	61.4%
Artificial Analysis	GPT-5.6 Sol (Xhigh) Terminal-Bench 4.0	24.7%
Artificial Analysis	GPT-5.6 Sol (Xhigh) Terminal-Bench 2.1	89.5%
Artificial Analysis	GPT-5.6 Sol (High) Coding Index	77.2
Artificial Analysis	GPT-5.6 Sol (High) Agentic Index	44.2
Artificial Analysis	GPT-5.6 Sol (High) GPQA Diamond	92.8%
Artificial Analysis	GPT-5.6 Sol (High) HLE	46.0%
Artificial Analysis	GPT-5.6 Sol (High) IFBench	69.2%
Artificial Analysis	GPT-5.6 Sol (High) τ²-Bench Telecom	83.3%
Artificial Analysis	GPT-5.6 Sol (High) AA-LCR	81.7%
Artificial Analysis	GPT-5.6 Sol (High) τ-Bench Banking	36.7%
Artificial Analysis	GPT-5.6 Sol (High) GDPval-AA	50.6%
Artificial Analysis	GPT-5.6 Sol (High) CritPt	25.7%
Artificial Analysis	GPT-5.6 Sol (High) SciCode	57.8%
Artificial Analysis	GPT-5.6 Sol (High) Terminal-Bench Hard	62.1%
Artificial Analysis	GPT-5.6 Sol (High) Terminal-Bench 4.0	20.7%
Artificial Analysis	GPT-5.6 Sol (High) Terminal-Bench 2.1	87.3%
Artificial Analysis	GPT-5.6 Sol (Medium) Coding Index	76.3
Artificial Analysis	GPT-5.6 Sol (Medium) Agentic Index	39.7
Artificial Analysis	GPT-5.6 Sol (Medium) GPQA Diamond	92.6%
Artificial Analysis	GPT-5.6 Sol (Medium) HLE	42.2%
Artificial Analysis	GPT-5.6 Sol (Medium) IFBench	69.6%
Artificial Analysis	GPT-5.6 Sol (Medium) τ²-Bench Telecom	81.0%
Artificial Analysis	GPT-5.6 Sol (Medium) AA-LCR	80.3%
Artificial Analysis	GPT-5.6 Sol (Medium) τ-Bench Banking	36.5%
Artificial Analysis	GPT-5.6 Sol (Medium) GDPval-AA	46.6%
Artificial Analysis	GPT-5.6 Sol (Medium) CritPt	22.9%
Artificial Analysis	GPT-5.6 Sol (Medium) SciCode	57.4%
Artificial Analysis	GPT-5.6 Sol (Medium) Terminal-Bench Hard	62.9%
Artificial Analysis	GPT-5.6 Sol (Medium) Terminal-Bench 4.0	14.6%
Artificial Analysis	GPT-5.6 Sol (Medium) Terminal-Bench 2.1	86.1%
Artificial Analysis	GPT-5.6 Sol (Max) Coding Index	77.4
Artificial Analysis	GPT-5.6 Sol (Max) Agentic Index	50.2
Artificial Analysis	GPT-5.6 Sol (Max) GPQA Diamond	94.1%
Artificial Analysis	GPT-5.6 Sol (Max) HLE	49.5%
Artificial Analysis	GPT-5.6 Sol (Max) IFBench	72.7%
Artificial Analysis	GPT-5.6 Sol (Max) τ²-Bench Telecom	85.1%
Artificial Analysis	GPT-5.6 Sol (Max) AA-LCR	84.0%
Artificial Analysis	GPT-5.6 Sol (Max) τ-Bench Banking	44.3%
Artificial Analysis	GPT-5.6 Sol (Max) GDPval-AA	55.9%
Artificial Analysis	GPT-5.6 Sol (Max) CritPt	32.3%
Artificial Analysis	GPT-5.6 Sol (Max) SciCode	57.1%
Artificial Analysis	GPT-5.6 Sol (Max) Terminal-Bench Hard	65.9%
Artificial Analysis	GPT-5.6 Sol (Max) Terminal-Bench 4.0	39.9%
Artificial Analysis	GPT-5.6 Sol (Max) Terminal-Bench 2.1	88.0%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) Coding Index	65.1
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) Agentic Index	28.1
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) GPQA Diamond	79.0%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) HLE	16.7%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) AA-LCR	62.3%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) τ-Bench Banking	19.6%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) GDPval-AA	37.5%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) CritPt	5.1%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) SciCode	47.7%
Artificial Analysis	GPT-5.6 Sol (Non-reasoning) Terminal-Bench 2.1	74.2%
Vals AI	GPT-5.6 Sol BioMysteryBench	71.1%
Vals AI	GPT-5.6 Sol Code Migration	52.9%
Vals AI	GPT-5.6 Sol CorpFin v2	64.4%
Vals AI	GPT-5.6 Sol CyberBench v1.1	76.3%
Vals AI	GPT-5.6 Sol EMB	72.3%
Vals AI	GPT-5.6 Sol Finance Agent (v2)	53.8%
Vals AI	GPT-5.6 Sol Financial Coaching Bench	74.9%
Vals AI	GPT-5.6 Sol GPQA Diamond	95.2%
Vals AI	GPT-5.6 Sol Harvey's Legal Agent Benchmark v1	2.5%
Vals AI	GPT-5.6 Sol IOI	91.2%
Vals AI	GPT-5.6 Sol LiveCodeBench	82.6%
Vals AI	GPT-5.6 Sol LegalBench	87.0%
Vals AI	GPT-5.6 Sol Legal Research Bench	48.1%
Vals AI	GPT-5.6 Sol MedCode	44.0%
Vals AI	GPT-5.6 Sol MedScribe	85.2%
Vals AI	GPT-5.6 Sol MMLU Pro	89.1%
Vals AI	GPT-5.6 Sol MMMU Pro	88.8%
Vals AI	GPT-5.6 Sol MortgageTax	67.3%
Vals AI	GPT-5.6 Sol MysteryMechanism	33.3%
Vals AI	GPT-5.6 Sol ProgramBench	1.5%
Vals AI	GPT-5.6 Sol ProofBench v1.1	83.0%
Vals AI	GPT-5.6 Sol Public Benefits Bench v1.1	66.5%
Vals AI	GPT-5.6 Sol Vals RSI Index	23.9%
Vals AI	GPT-5.6 Sol SAGE v1	52.6%
Vals AI	GPT-5.6 Sol Vals Science Index	41.5%
Vals AI	GPT-5.6 Sol SkillsBench	54.1%
Vals AI	GPT-5.6 Sol SRE Bench	30.5%
Vals AI	GPT-5.6 Sol SWE-bench	96.2%
Vals AI	GPT-5.6 Sol Tax Agent Bench	31.1%
Vals AI	GPT-5.6 Sol TaxEval v2	74.8%
Vals AI	GPT-5.6 Sol Terminal-Bench 4.0	37.9%
Vals AI	GPT-5.6 Sol Terminal-Bench-Science	20.0%
Vals AI	GPT-5.6 Sol Vals Index	58.0%
Vals AI	GPT-5.6 Sol Vals Multimodal Index	72.6%
Vals AI	GPT-5.6 Sol Vibe Code Bench 1-100	20.0%
Vals AI	GPT-5.6 Sol Vibe Code Bench v1.1	80.5%
Vals AI	GPT-5.6 Sol Vals Web Search Index	43.6%

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.

Codex

A coding agent that helps you build and ship with AI

316Btokens

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.

57.6Btokens

There are many coding agents, but this one is yours.

55.3Btokens

omp

new

20.4Btokens

Hark SITO SFT datagen

new

17.9Btokens

Rest of OpenRouter

13.1B

Top 5 Apps

3.25B

OpenAI: GPT Sol versions

Available through EU in-region routing

OpenAI: GPT-5.6 Sol is available through EU in-region routing. Requests sent to eu.openrouter.ai are decrypted in the EU and routed only to shared provider endpoints in Europe (the EU/EEA, the UK, and Switzerland).

Providers in Europe

Azure

Prices in Europe

Azure: $4.40/M tokens input, $22/M tokens output

Base URL

https://eu.openrouter.ai/api/v1

Plan

Requires Business or Enterprise. Self-serve on Business: no contract, no monthly minimum. OpenRouter Business for EU in-region routing

Fails closed: if no shared provider endpoint in Europe is available, the request errors instead of leaving the region. Requests served by your own BYOK key go to your deployment’s region, which you control. In-region routing docs

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OpenAI: GPT-5.6 Sol

Providers