Claude 3.5 SonnetvsClaude Haiku 4.5
Claude 3.5 Sonnet | Claude Haiku 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. | — | $1.00 |
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. | — | $5.00 |
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. | — | $0.10 |
| 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% | 77% |
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% | 73.3% |
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% | 73% |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Jun 20 2024 | Oct 15 2025 |
| Access | Proprietary | Proprietary |
Frequently asked questions
Claude Haiku 4.5 leads Claude 3.5 Sonnet on 3 of the 3 benchmarks they both report (BullshitBench v2, SWE-Bench Verified, GPQA Diamond). Only Claude Haiku 4.5 has a verified first-party API price: $1.00 per million input tokens and $5.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3.5 Sonnet. Claude 3.5 Sonnet shipped 482 days before Claude Haiku 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 BullshitBench v2, Claude Haiku 4.5 leads at 77% vs Claude 3.5 Sonnet at 45%. On SWE-Bench Verified, Claude Haiku 4.5 leads at 73.3% vs Claude 3.5 Sonnet at 33.4%. On GPQA Diamond, Claude Haiku 4.5 leads at 73% vs Claude 3.5 Sonnet at 59.4%.
Claude 3.5 Sonnet was released by Anthropic on Jun 20 2024.
Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.
Claude Haiku 4.5 leads on SWE-Bench Verified — Claude 3.5 Sonnet 33.4% vs Claude Haiku 4.5 73.3%.
Claude Haiku 4.5 leads on GPQA Diamond — Claude 3.5 Sonnet 59.4% vs Claude Haiku 4.5 73%.
Only Claude Haiku 4.5 has a verified first-party API price: $1.00 per million input tokens and $5.00 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.