Models · OpenAI · Out sinceReleased 9 Jul 2026

GPT-5.6 Sol Pro

Available on OpenRouterOn OpenRouterAvailable nowGenerally availableClosed (can't be downloaded)Proprietary

Where you can use it:In apps:ChatGPT (Business plan) · Pro

GPT-5.6 Sol Pro is made by OpenAI. We don't have enough test results yet to rank it. It's expensive to use.

GPT-5.6 Sol with reasoning.mode="pro" (OpenRouter id).

Writing & creativity: —
Research & analysis: —
Coding: —
Price: Expensive$4 / $20
Price per 1M (blended)Blended / 1M: $8
MemoryContext: 1.1M
Longest answerMax output: 128K
Test resultsResults: 2 (2 independent2 indep.)
Out sinceReleased: 9 Jul 2026
Made byVendor: OpenAI
UnderstandsInputs: text, image

Scores are out of 100 for each area, compared with every model we track; “#” is its rank. Context is how much text it can read at once (1M is roughly 700,000 words). Blended price mixes the cost of what you send and what it writes back.

Thinking levels

Reasoning settings

No reasoningLowMediumHighExtra highMax

Links

Using it through OpenRouter

On OpenRouter

OpenRouter is a service that gives access to many AI models in one place. This model is listed there as openai/gpt-5.6-sol-pro.

Route it as openai/gpt-5.6-sol-pro at $4 in / $20 out per 1M tokens, 1.1M context. Listed since 9 Jul 2026.

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools

Every test result

Every result

All the numbers,with where they came from.

Every result we've found for this model, with who measured it and a link to where we read it.

All raw rows (vendor and independent kept separate), with setting label, source, date, harness and notes.

All results for this model
						NotesNotes
FrontierMath Tier 4	80.5%	Maxgpt-5.6-sol_promax	Independent testIndependentEpoch AI ↗	9 Jul 2026	—	FrontierMath Tier 4 (v2), Epoch-run; stderr 6.3pt; data https://epoch.ai/data/benchmark_data.zip (frontiermath_tier_4_v2.csv)
SimpleBench	71.7%	Extra highGPT-5.6 Sol Pro (xhigh)	Independent testIndependentSimpleBench ↗	9 Jul 2026	—	AVG@5, temp 0.7; rank 16th; human baseline 83.7%; data https://simple-bench.com/static/js/leaderboard-data.js