Claude Sonnet 5 vs GPT 5.1
Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.
Frontier-grade model with strong general-purpose reasoning.
No captured outputs for these models yet.
Frequently Asked Questions: Claude Sonnet 5 vs GPT 5.1▼
Which is better, Claude Sonnet 5 or GPT 5.1?
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Based on the Capability Index, GPT 5.1 scores higher (81.6 vs 80.1). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, Claude Sonnet 5 or GPT 5.1?
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GPT 5.1 has a lower blended cost. Claude Sonnet 5: $3.00 input / $15.00 output. GPT 5.1: $1.25 input / $10.00 output.
Which has a larger context window, Claude Sonnet 5 or GPT 5.1?
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Claude Sonnet 5 has a larger context window: Claude Sonnet 5 supports 1M tokens vs GPT 5.1 at 400K tokens.
Do both Claude Sonnet 5 and GPT 5.1 support vision?
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Yes, both Claude Sonnet 5 and GPT 5.1 support vision/image input.
What are the key differences between Claude Sonnet 5 and GPT 5.1?
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Key differences: GPT 5.1 is significantly cheaper. Compare full specs on this page.
Which model should I choose for my use case?
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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 Claude Sonnet 5 and GPT 5.1 for free on idapt.app to see which performs better for your specific needs.