Claude 3.5 SonnetvsGPT-5.2
Claude 3.5 Sonnet | GPT-5.2 | |
|---|---|---|
| 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. | — | $1.75 |
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. | — | $14.00 |
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. | — | $0.175 |
| Benchmarks | ||
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. | 45% | 38% |
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. | 33.4% | 80% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 59.4% | 92.4% |
| BenchmarksPublished by one model only | ||
ARC-AGI-2Abstract reasoning — Puzzle-style tests of abstract reasoning and pattern-finding — the kind of thing people find easy but AIs often struggle with. Higher is better. | — | 52.9% |
Arena Elo (Text)Community preference — Real people chat with two anonymous AIs side by side and vote for the answer they prefer. Votes become a chess-style Elo rating on arena.ai — it measures which AI people actually like, not test scores. Higher is better. | — | 1476 |
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. | — | 1419 |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Jun 20 2024 | Dec 11 2025 |
| Access | Proprietary | Proprietary |
Frequently asked questions
GPT-5.2 leads Claude 3.5 Sonnet on 2 of the 3 benchmarks they both report (BullshitBench v2, SWE-Bench Verified, GPQA Diamond). Only GPT-5.2 has a verified first-party API price: $1.75 per million input tokens and $14.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3.5 Sonnet. Claude 3.5 Sonnet shipped 539 days before GPT-5.2, 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 BullshitBench v2, Claude 3.5 Sonnet leads at 45% vs GPT-5.2 at 38%. On SWE-Bench Verified, GPT-5.2 leads at 80% vs Claude 3.5 Sonnet at 33.4%. On GPQA Diamond, GPT-5.2 leads at 92.4% vs Claude 3.5 Sonnet at 59.4%.
Claude 3.5 Sonnet was released by Anthropic on Jun 20 2024.
GPT-5.2 was released by OpenAI on Dec 11 2025.
GPT-5.2 leads on SWE-Bench Verified — Claude 3.5 Sonnet 33.4% vs GPT-5.2 80%.
GPT-5.2 leads on GPQA Diamond — Claude 3.5 Sonnet 59.4% vs GPT-5.2 92.4%.
Only GPT-5.2 has a verified first-party API price: $1.75 per million input tokens and $14.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3.5 Sonnet. Rates are pay-as-you-go API prices verified on August 18, 2026.