Claude 3 SonnetvsGPT-5.1
Claude 3 Sonnet | GPT-5.1 | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | — | $1.25 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | — | $10.00 |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | — | $0.125 |
| Benchmarks | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 40.4% | 88.1% |
| BenchmarksPublished by one model only | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 25% |
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 76.3% |
MMMUMultimodal — Tests the AI on understanding images and text together across many college subjects. Higher is better. | — | 76% |
Arena Elo (Code)Community preference (code) — Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | — | 1391 |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Mar 4 2024 | Nov 12 2025 |
| Access | Proprietary | Proprietary |
Frequently asked questions
GPT-5.1 leads Claude 3 Sonnet on 1 of the 1 benchmark they both report (GPQA Diamond). Only GPT-5.1 has a verified first-party API price: $1.25 per million input tokens and $10.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3 Sonnet. Claude 3 Sonnet shipped 618 days before GPT-5.1, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On GPQA Diamond, GPT-5.1 leads at 88.1% vs Claude 3 Sonnet at 40.4%.
Claude 3 Sonnet was released by Anthropic on Mar 4 2024.
GPT-5.1 was released by OpenAI on Nov 12 2025.
GPT-5.1 leads on GPQA Diamond — Claude 3 Sonnet 40.4% vs GPT-5.1 88.1%.
Only GPT-5.1 has a verified first-party API price: $1.25 per million input tokens and $10.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3 Sonnet. Rates are pay-as-you-go API prices verified on August 18, 2026.