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GPT-5.6 Sol

GPT-5.6 · Released 2026-07-09

OpenAI's July 2026 GPT-5.6 flagship, superseded as the current OpenAI flagship by GPT-6 Astra on 3 Sep 2026. Promo API list still $4 / $20 per 1M tokens (short context) through 21 Nov 2026.

July 2026 GPT-5.6 Sol line. GPT-6 Sol (22 Sep 2026) is the current Sol tier. This promo list is unchanged. Prefer sourced Vals and AA ledger rows.

Composite64
Context1M
Input / 1M$4.0
Output / 1M$20
Knowledge cutoffunpublished
Output speed85 t/s
Statusflagship

Family profile

Best published score in each covered benchmark family.

80/100 avg
Knowledge
59
Reasoning
94
Coding
73
Agentic
88
Multimodal
83
Long context
84

6 tested benchmark families

Editor's note
Sol moved from limited preview to general availability on July 9, 2026. GPT-6 Astra is now the OpenAI flagship (3 Sep 2026). Editorial depth still needs a desk pass.
Benchmark placements

Where GPT-5.6 Sol places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.

BenchmarkFamilyRankScoreSourceDate
CritPtReasoning#1/ 1232Artificial Analysis — CritPt2026-09-01
DeepSWECoding#2/ 873DeepSWE leaderboard2026-08-04
Terminal-Bench-ScienceAgentic#2/ 922Terminal-Bench-Science 0.1 announcement2026-08-27
AA-OmniscienceKnowledge#4/ 1259Artificial Analysis — AA-Omniscience2026-09-01
MMMU-ProMultimodal#4/ 883Artificial Analysis — MMMU-Pro2026-09-01
AA-LCRLong context#7/ 18484Artificial Analysis2026-09-28
GPQA DiamondReasoning#7/ 18494Artificial Analysis2026-09-28
Terminal-BenchAgentic#7/ 16788Artificial Analysis2026-09-28
Humanity's Last ExamReasoning#9/ 18650Artificial Analysis2026-09-28
SciCodeCoding#14/ 9757Artificial Analysis2026-09-28
AA output speedPerformance#73/ 195Artificial Analysis2026-10-12
Family context

The three highest-scoring models with pages in each capability family. Where GPT-5.6 Sol shows up, it's highlighted.

ReasoningGPT-5.6 Sol · 94
  1. 1
    GPT-6 Astra
    96
  2. 2
    Claude Mythos Preview
    95
  3. 3
    Gemini 3.7 Flash
    95
Long contextGPT-5.6 Sol · 84
  1. 1
    Kimi K3
    89
  2. 2
    MiMo-V2.6-Pro
    86
  3. 3
    Claude Fable 5.1
    85
Newest receipts

Benchmark rows added to the public ledger for GPT-5.6 Sol in the last 120 days. Older rows live in the full table below.

11 recent
BenchmarkFamilyScoreSourceDays ago
AA output speedPerformance85 t/sArtificial Analysis10
AA-LCRLong context84%Artificial Analysis24
GPQA DiamondReasoning94.1%Artificial Analysis24
Humanity's Last ExamReasoning49.5%Artificial Analysis24
SciCodeCoding57.1%Artificial Analysis24
Terminal-BenchAgentic88.01%Artificial Analysis24
CritPtReasoning32.3%Artificial Analysis — CritPt51
AA-OmniscienceKnowledge59.4%Artificial Analysis — AA-Omniscience51
MMMU-ProMultimodal83.4%Artificial Analysis — MMMU-Pro51
Terminal-Bench-ScienceAgentic22.4%Terminal-Bench-Science 0.1 announcement56
DeepSWECoding73%DeepSWE leaderboard79
Family coverage

A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.

Knowledge59
Reasoning94
Coding73
Agentic88
Multimodal83
Long context84
Price vs. performance
0255075100$0.10$0.30$1$3$10$30input USD / 1M tokens · log scale →← intelligence

Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.

AnthropicOpenAIGoogleAlibabaMetaZhipuxAIDeepSeekMiniMaxXiaomiMoonshotOtherMeituanMistralNVIDIACohere

Full benchmark ledger

Every catalog benchmark for GPT-5.6 Sol. Scores link to the original source; gaps mean no public row exists yet.

11 sourced rows

11 of 13 catalog benchmarks have a sourced row for GPT-5.6 Sol.

Knowledge

Reasoning

Coding

Agentic

Multimodal

Long context

Performance

Changelog
  1. GPT-6 Sol is the current Sol line. This promo list is unchanged.
  2. GPT-6 Astra remains the current OpenAI flagship; Sol stays the cheaper GPT-5.6 line.
  3. GPT-6 Astra is the current OpenAI flagship; Sol stays the cheaper GPT-5.6 line.
  4. Recorded general availability across ChatGPT, Codex, and the API, then refreshed Vals and Artificial Analysis benchmark evidence.
  5. Updated public pricing: Sol is listed at $5 input / $30 output per 1M tokens, with 1.25x cache-write billing and 90% cached-read discount.
  6. OpenAI previewed GPT-5.6 Sol alongside Terra and Luna.
Sources

Questions this model page answers

Every answer below is assembled from the dated fields on this page. Nothing is written separately for search.

What is GPT-5.6 Sol?

GPT-5.6 Sol is a OpenAI model: OpenAI's July 2026 GPT-5.6 flagship, superseded as the current OpenAI flagship by GPT-6 Astra on 3 Sep 2026. Promo API list still $4 / $20 per 1M tokens (short context) through 21 Nov 2026.

What is GPT-5.6 Sol for?

July 2026 GPT-5.6 Sol line. GPT-6 Sol (22 Sep 2026) is the current Sol tier. This promo list is unchanged. Prefer sourced Vals and AA ledger rows.

What does GPT-5.6 Sol cost?

GPT-5.6 Sol lists $4.0 input and $20 output per 1M tokens. Pricing last checked 2026-09-01.

How large is the GPT-5.6 Sol context window?

GPT-5.6 Sol publishes a 1M token context window.

What is the VerdictPal status of GPT-5.6 Sol?

GPT-5.6 Sol carries Flagship status on the model atlas.

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