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GPT 5.1 Codex vs GPT 5.6 Sol

At a glance

Previous-generation coding-optimized model for software engineering.

400K ctx$1.25/$10.00 per M

OpenAI's GPT-5.6 flagship — built for complex reasoning, agentic coding, and long-running professional work.

1.1M ctx$5.00/$30.00 per M
Agent Demos
All agent demos

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
No benchmarks available

This model hasn't been benchmarked yet.

Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-11
Reasoning & Knowledge
Graduate Science94.6%
Agentic
Terminal Tasks88.8%
Specs
400K
Context
128K
Max output
Nov 2025
Released
1.1M
Context
128K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input75%$1.25/M tokens
Output67%$10.00/M tokens
Cache read75%$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$5.00/M tokens
Output$30.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Chat with GPT 5.1 CodexGo to model
Chat with GPT 5.6 SolGo to model
Frequently Asked Questions: GPT 5.1 Codex vs GPT 5.6 Sol▼

Which is better, GPT 5.1 Codex or GPT 5.6 Sol?

▼

Both GPT 5.1 Codex and GPT 5.6 Sol are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.1 Codex or GPT 5.6 Sol?

▼

GPT 5.1 Codex has a lower blended cost. GPT 5.1 Codex: $1.25 input / $10.00 output. GPT 5.6 Sol: $5.00 input / $30.00 output.

Which has a larger context window, GPT 5.1 Codex or GPT 5.6 Sol?

▼

GPT 5.6 Sol has a larger context window: GPT 5.1 Codex supports 400K tokens vs GPT 5.6 Sol at 1.1M tokens.

Do both GPT 5.1 Codex and GPT 5.6 Sol support vision?

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Yes, both GPT 5.1 Codex and GPT 5.6 Sol support vision/image input.

What are the key differences between GPT 5.1 Codex and GPT 5.6 Sol?

▼

Key differences: GPT 5.1 Codex is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.1 Codex and GPT 5.6 Sol for free on idapt.app to see which performs better for your specific needs.

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