Claude Haiku 4.5 vs GPT-5
Anthropic Claude Haiku 4.5 | OpenAI GPT-5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Oct 15 2025 | Aug 7 2025 |
| Access | Proprietary | Proprietary |
| 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%Best | 21% |
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% | — |
Community preference (code) Arena Elo (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. | — | 1394 |
| Timeline | ||
| Release gap | GPT-5 shipped 69 days before Claude Haiku 4.5 | |
Which is better: Claude Haiku 4.5 or GPT-5?
Claude Haiku 4.5 leads GPT-5 on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5 shipped 69 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 GPT-5 at 21%.
Frequently asked questions
Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.
GPT-5 was released by OpenAI on Aug 7 2025.
Other comparisons
Claude Haiku 4.5 vs Gemini OmniGPT-5 vs Gemini OmniClaude Haiku 4.5 vs Muse Spark 1.1GPT-5 vs Muse Spark 1.1Claude Haiku 4.5 vs Grok 4.5GPT-5 vs Grok 4.5Claude Haiku 4.5 vs DeepSeek-V4-ProGPT-5 vs DeepSeek-V4-ProClaude Haiku 4.5 vs Mistral Medium 3.5GPT-5 vs Mistral Medium 3.5Claude Haiku 4.5 vs Kimi K2.7 CodeGPT-5 vs Kimi K2.7 Code