Compare / head-to-head
Claude 3.5 SonnetvsGPT-5 nano
GPT-5 nano leads 4 of 4 shared benchmarks. GPT-5 nano is 40x cheaper per token. GPT-5 nano has the larger context window (400K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 4
GPT-5 nano leads
Cheaper per token
GPT-5 nano
40x cheaper, input + output
Larger context
GPT-5 nano
400K tokens
Provider uptime (30d)
100% · 94.2446%
Anthropic · OpenAI
Claude 3.5 Sonnet
Anthropic · released 2024-10-22
textvision
GPT-5 nano
OpenAI · released 2025-08-07
textvision
Quality
Benchmark matrix
4 shared · 0 only Claude 3.5 Sonnet · 3 only GPT-5 nano| Benchmark | Claude 3.5 Sonnet | GPT-5 nano | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| SWE-bench Verified | 49% ↗ | 54.7% ↗ | -5.7 pt | GPT-5 nano |
| GPQA Diamond | 55.3% ↗epoch | 69.4% ↗epoch | -14.1 pt | GPT-5 nano |
| AIME 2025 | 3.3% ↗matharena | 85% ↗matharena ⚠ | -81.7 pt | GPT-5 nano |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 8.5% ↗epoch | 81.1% ↗epoch | -72.6 pt | GPT-5 nano |
| Only Claude 3.5 Sonnet reports · 0 | ||||
| Claude 3.5 Sonnet reports nothing GPT-5 nano does not. | ||||
| Only GPT-5 nano reports · 3 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 2.4% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 20% ↗epoch | — | — |
| SimpleQA Verified | not reported | 11.7% ↗epoch | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude 3.5 Sonnet minus GPT-5 nano in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude 3.5 Sonnet | GPT-5 nano | Edge |
|---|---|---|---|
| Context window | 200K tokens | 400K tokens | GPT-5 nano |
| Max output | 8K tokens | 128K tokens | GPT-5 nano |
| Input price / 1M | $3 ↗ | $0.05 ↗ | GPT-5 nano |
| Output price / 1M | $15 ↗ | $0.4 ↗ | GPT-5 nano |
| Cached input / 1M | $0.3 ↗ | $0.005 ↗ | GPT-5 nano |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $18 | $0.45 | GPT-5 nano |
| Modalities | text · vision | text · vision | Tie |
| Released | 2024-10-22 | 2025-08-07 | — |
| Cited benchmark scores | 4 | 7 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude 3.5 Sonnet vs …
Models sharing the most benchmarksMore matchups
GPT-5 nano vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude 3.5 Sonnet and GPT-5 nano on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.