GPT

GPT-5.6 Sol

GPTBalanced
ThinkingTool UseVisionStructured Output

About this model

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...

Performance Tier

Balanced

GPT-5.6 Sol is a balanced model from GPT : strong performance at a reasonable price.

Strong cost-performance ratio. Reliable for most professional use cases without premium pricing.

Pricing

This model is included in Elosia plans
High

High pricing. Reserve this level for tasks that demand maximum quality.

Typeper 1M tokens
Input (prompt)$4.00
Output (completion)$20.00
Cache read$0.400
Cache write$5.00

Capabilities

Context Length1.1M
Max Output Tokens128K
TokenizerGPT
Inputfile, image, text
Outputtext
Release DateJuly 9, 2026

Benchmarks

General Intelligence
MMLU
Not reported
Mathematics
MATH-500
Not reported
Programming
HumanEval
Not reported
Reasoning
ARC-AGI-2
85.4%
Agentic
SWE-bench Pro
64.6%
Terminal-Bench 2.1
88.8%

Where does GPT-5.6 Sol stand?

Compare its performance index against every other model.

View the performance leaderboard

Recommended Use Cases

CodingAnalysisResearchMathematicsData Extraction

Strengths

  • Top tier of the GPT-5.6 family, particularly strong at command-line and multi-step coding tasks
  • Abstract reasoning that scales markedly with reasoning effort, from low up to max
  • Optional ultra mode coordinates several agents in parallel for harder tasks
  • 1M-token context window with programmatic tool calling and multimodal (text, image, file) input

Limitations

  • Resolution of issues inside existing codebases (SWE-bench Pro) is weaker than its command-line results
  • OpenAI published no MMLU, GPQA or math benchmarks for GPT-5.6, so direct comparison with older models is harder
  • High and maximum reasoning efforts, and ultra mode, consume many more tokens per query and add latency

Frequently asked questions

Resources

This model may use your data for training

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