Claude Haiku 4.5 vs DeepSeek Chat (R1-based)
Anthropic Claude Haiku 4.5 | DeepSeek DeepSeek Chat (R1-based) | |
|---|---|---|
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Oct 15 2025 | Jan 20 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given 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. | 77% | — |
Coding SWE-Bench VerifiedReal 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. | 73.3% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 73% | — |
| Timeline | ||
| Release gap | DeepSeek Chat (R1-based) shipped 268 days before Claude Haiku 4.5 | |
Which is better: Claude Haiku 4.5 or DeepSeek Chat (R1-based)?
Claude Haiku 4.5 and DeepSeek Chat (R1-based) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek Chat (R1-based) shipped 268 days before Claude Haiku 4.5, so benchmark comparisons should account for the intervening progress.
Claude Haiku 4.5 is proprietary, while DeepSeek Chat (R1-based) is open weight.
Direct benchmark comparisons are unavailable — Claude Haiku 4.5 and DeepSeek Chat (R1-based) don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.
DeepSeek Chat (R1-based) was released by DeepSeek on Jan 20 2025.
Claude Haiku 4.5 is a proprietary model released by Anthropic. DeepSeek Chat (R1-based) is an open weight model released by DeepSeek.