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OpenAI: GPT-5.6 Sol

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openai/gpt-5.6-sol

GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series.

Context
1.1M
Input
$5 / 1M
Output
$30 / 1M
Released
Jul 9, 2026
Modalities
fileimagetext→text
Strongest atReasoning & Knowledge top 1%Coding top 4%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.6 Sol lands among all models tracked on Model Beat.

80.0
Intelligence Index
Artificial Analysis
80th percentile of tracked models
96.0
Coding Index
Artificial Analysis
96th percentile of tracked models
44.0
Agentic Index
Artificial Analysis
44th percentile of tracked models

Reasoning

2 evals
GPQA Diamond94.1%

Graduate-level scientific reasoning

Humanity's Last Exam47.2%

Frontier of human expert knowledge

Coding

1 evals
SciCode56.1%

Scientific research coding

Agentic & Tools

1 evals
τ²-bench85.1%

Tool-agent-user reliability

Compare GPT-5.6 Sol with

GPT-5.6 Sol vs Claude Fable 5GPT-5.6 Sol vs GPT-5.5GPT-5.6 Sol vs Gemini 3.1 ProGPT-5.6 Sol vs Muse SparkGPT-5.6 Sol vs Qwen 3.7 Max

Frequently asked questions

What is GPT-5.6 Sol?

GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series.

Who created GPT-5.6 Sol?

GPT-5.6 Sol is an AI model developed by OpenAI, part of the GPT family, released Jul 9, 2026.

How much does GPT-5.6 Sol cost?

GPT-5.6 Sol's list price from OpenAI is $5 per million input tokens and $30 per million output tokens.

What is GPT-5.6 Sol's context window?

GPT-5.6 Sol supports a context window of up to 1.1M tokens.

How does GPT-5.6 Sol perform on benchmarks?

On standardized evaluations tracked by Epoch AI, GPT-5.6 Sol scores 47.2% on Humanity's Last Exam, 94.1% on GPQA Diamond, 56.1% on SciCode.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Jul 9, 2026.