GPT

GPT-5.6 Sol Pro

GPTBalanced

This model is no longer available on Elosia. This page is kept for informational purposes.

ThinkingTool UseVisionStructured Output

About this model

GPT-5.6 Sol Pro is the same underlying model as GPT-5.6 Sol, served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...

Performance Tier

Balanced

GPT-5.6 Sol Pro 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 Pro stand?

Compare its performance index against every other model.

View the performance leaderboard

Recommended Use Cases

CodingAnalysisResearchMathematicsData Extraction

Strengths

  • GPT-5.6 Sol served in pro reasoning mode, for maximum quality on complex tasks
  • Strong abstract reasoning: ARC-AGI-2 85.4 at high effort, reaching 90.0 (xhigh) and 92.5 (max) with more reasoning
  • Capable agentic coding: 88.8 on Terminal-Bench 2.1 and 64.6 on SWE-bench Pro (single-agent), strong on command-line and long-horizon work
  • 1M-token context window with programmatic tool calling and multimodal (text, image, file) input

Limitations

  • Pro reasoning mode consumes more tokens per query than base Sol, so it uses up quota faster
  • 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 flagships is harder

Frequently asked questions

Resources

This model may use your data for training

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