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Claude 3.7 Sonnet vs GPT-5 nano

SpecClaude 3.7 SonnetGPT-5 nano
Respan Index19.0 (#124)19.0 (#124)
Blended price per 1M-$0.069
Context window200K400K
Input / output per 1M-$0.025 / $0.2
Max output128K128K
Inputtext, visiontext, vision
Released2025-02-242025-08-07

Respan Index by category

Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.

CategoryClaude 3.7 SonnetGPT-5 nano
Coding7.5 Claude 3.7 Sonnet4.5 GPT-5 nano
Agents14.2 Claude 3.7 Sonnet19.3* GPT-5 nano
Reasoning22.0 Claude 3.7 Sonnet25.0 GPT-5 nano
Knowledge & language15.2* Claude 3.7 Sonnet11.7 GPT-5 nano
Human preference43.7 Claude 3.7 Sonnet37.2 GPT-5 nano

* Estimated: no published scores in that category. How the Respan Index works

Benchmarks both report

Claude 3.7 Sonnet leads on 4 of the 7 benchmarks both report. Higher is better. Each score links to where it was published.

BenchmarkClaude 3.7 SonnetGPT-5 nano
LMArena Elo13881338
LMArena Vision (LMArena)11931147
GPQA Diamond79.7%69.4%
MATH Level 5 (Epoch AI)91.2%95.2%
OTIS Mock AIME 2024-2025 (Epoch AI)57.8%81.1%
AIME 202549.2%85%
SWE-bench Verified70.3%54.7%

FAQ

Is Claude 3.7 Sonnet better than GPT-5 nano?

Claude 3.7 Sonnet and GPT-5 nano tie on the Respan Index at 19.0. Claude 3.7 Sonnet leads on 4 of the 7 benchmarks both report.

Which has the larger context window?

Claude 3.7 Sonnet accepts 200K tokens and GPT-5 nano 400K tokens.

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