Claude 3 SonnetvsClaude Sonnet 4.5
Claude 3 Sonnet | Claude Sonnet 4.5 | |
|---|---|---|
| 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. | — | $3.00 |
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. | — | $15.00 |
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. | — | $0.30 |
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | — | $3.00Amazon Bedrock |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | — | $15.00Amazon Bedrock |
| 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% | 83.4% |
| 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. | — | 79% |
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. | — | 77.2% |
Next.js EvalsNext.js coding — Vercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | — | 39% |
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. | — | 13.6% |
OSWorld-VerifiedAgentic computer use — Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | — | 61.4% |
MMMUMultimodal — Tests the AI on understanding images and text together across many college subjects. Higher is better. | — | 68% |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Mar 4 2024 | Sep 29 2025 |
| Access | Proprietary | Proprietary |
Other comparisons
Claude 3 SonnetvsGPT-6 AstraClaude Sonnet 4.5vsGPT-6 AstraClaude 3 SonnetvsGemini 3.8 FlashClaude Sonnet 4.5vsGemini 3.8 FlashClaude 3 SonnetvsMuse Spark 1.3Claude Sonnet 4.5vsMuse Spark 1.3Claude 3 SonnetvsGrok 4.6Claude Sonnet 4.5vsGrok 4.6Claude 3 SonnetvsDeepSeek-V4.1-FlashClaude Sonnet 4.5vsDeepSeek-V4.1-FlashClaude 3 SonnetvsMistral Medium 3.5Claude Sonnet 4.5vsMistral Medium 3.5
Frequently asked questions
Claude Sonnet 4.5 leads Claude 3 Sonnet on 1 of the 1 benchmark they both report (GPQA Diamond). Only Claude Sonnet 4.5 has a verified first-party API price: $3.00 per million input tokens and $15.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3 Sonnet. Claude 3 Sonnet shipped 574 days before Claude Sonnet 4.5, 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, Claude Sonnet 4.5 leads at 83.4% vs Claude 3 Sonnet at 40.4%.