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GPT 6.1 Sol Pro vs GPT 5.1 Codex

At a glance

OpenAI's GPT-6.1 Sol served in pro reasoning mode for the hardest problems.

1.1M ctx$2.00/$10.00 per M

Previous-generation coding-optimized model for software engineering.

400K ctx$1.25/$10.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper14%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
400K
Context
128K
Max output
Nov 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$2.00/M tokens
Output$10.00/M tokens
Cache read23%$0.10/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input38%$1.25/M tokens
Output$10.00/M tokens
Cache read$0.13/M tokens
Web search$0.01/search
Chat with GPT 6.1 Sol ProGo to model
Chat with GPT 5.1 CodexGo to model
Frequently Asked Questions: GPT 6.1 Sol Pro vs GPT 5.1 Codex▼

Which is better, GPT 6.1 Sol Pro or GPT 5.1 Codex?

▼

Both GPT 6.1 Sol Pro and GPT 5.1 Codex 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 6.1 Sol Pro or GPT 5.1 Codex?

▼

GPT 5.1 Codex has a lower blended cost. GPT 6.1 Sol Pro: $2.00 input / $10.00 output. GPT 5.1 Codex: $1.25 input / $10.00 output.

Which has a larger context window, GPT 6.1 Sol Pro or GPT 5.1 Codex?

▼

GPT 6.1 Sol Pro has a larger context window: GPT 6.1 Sol Pro supports 1.1M tokens vs GPT 5.1 Codex at 400K tokens.

Do both GPT 6.1 Sol Pro and GPT 5.1 Codex support vision?

▼

Yes, both GPT 6.1 Sol Pro and GPT 5.1 Codex support vision/image input.

What are the key differences between GPT 6.1 Sol Pro and GPT 5.1 Codex?

▼

GPT 6.1 Sol Pro and GPT 5.1 Codex have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.

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 6.1 Sol Pro and GPT 5.1 Codex for free on idapt.app to see which performs better for your specific needs.

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