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- Oct 15, 202590% CONFIDENCEfrom the source
Claude Haiku 4.5 Released
- Anthropic released Claude Haiku 4.5 on 15 October 2025, two weeks after Claude Sonnet 4.5, "available today to all users" including Claude's free plans[1][5][6]
- Developers get it as claude-haiku-4-5 on the Claude API, Amazon Bedrock and Google Cloud's Vertex AI, as a drop-in replacement for both Haiku 3.5 and Sonnet 4[1][4]
- Anthropic pitches it for pairing: Sonnet 4.5 breaks a problem into a plan and orchestrates several Haiku 4.5 sub-agents working in parallel[1][6]
- It ships under ASL-2 rather than the ASL-3 standard used for Sonnet 4.5 and Opus 4.1, and Anthropic calls it "our safest model yet" by its automated alignment measure[1][3]
- Still the current Haiku in September 2026, eleven months on, with retirement not before 15 October 2026[2]
Notable features
- "What was recently at the frontier is now cheaper and faster": coding on a par with Claude Sonnet 4 at one-third the cost and more than twice the speed[1][6]
- Priced at $1 per million input tokens and $5 per million output tokens[1][4]
- 73.3% on SWE-bench Verified, 41.0% on Terminal-Bench and 50.7% on OSWorld computer use against Sonnet 4's 72.7%, 36.4% and 42.2%[1][6]
- A 200K-token context window, 64K max output and extended thinking, with a February 2025 reliable knowledge cutoff[2]
- Faster computer use makes Claude for Chrome quicker, and it makes Claude Code "markedly more responsive" for multi-agent projects and prototyping[1]
Benchmarks[1]
| Benchmark | Claude Sonnet 4.5 | Claude Haiku 4.5 | Claude Sonnet 4 | GPT-5 | Gemini 2.5 Pro |
|---|---|---|---|---|---|
| SWE-bench Verified (agentic coding) | 77.2% | 73.3% | 72.7% | 72.8% GPT-5 (high), 74.5% GPT-5-Codex | 67.2% |
| Terminal-Bench (agentic terminal coding) | 50.0% | 41.0% | 36.4% | 43.8% | 25.3% |
| τ2-bench (agentic tool use) | Retail 86.2%, Airline 70.0%, Telecom 98.0% | Retail 83.2%, Airline 63.6%, Telecom 83.0% | Retail 83.8%, Airline 63.0%, Telecom 49.6% | Retail 81.1%, Airline 62.6%, Telecom 96.7% | — |
| OSWorld (computer use) | 61.4% | 50.7% | 42.2% | — | — |
| AIME 2025 (high school math competition) | 100% (python), 87.0% (no tools) | 96.3% (python), 80.7% (no tools) | 70.5% | 99.6% (python), 94.6% (no tools) | 88.0% |
| GPQA Diamond (graduate-level reasoning) | 83.4% | 73.0% | 76.1% | 85.7% | 86.4% |
| MMMLU (multilingual Q&A) | 89.1% | 83.0% | 86.5% | 89.4% | — |
| MMMU, validation (visual reasoning) | 77.8% | 73.2% | 74.4% | 84.2% | 82.0% |
References 689% CONFIDENCEOverall confidence: 89%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]90%anthropic.com/news/claude-haiku-4-5anthropic.com· Posted Sep 28, 2026· Starts Oct 15, 2025 ✓· 22% of score
Anthropic's[3][4] post is dated "Oct 15, 2025": "Claude[2] Haiku 4.5, our latest small model, is available today to all users"; the Claude release notes ("October 15, 2025 We've launched Claude Haiku 4.5"), CNBC[5] and TechCrunch[6] agree.
- [2]90%Models overview - Claude Platform Docsplatform.claude.com· Added Sep 28, 2026· 22% of score
Anthropic's[1][3][4] model table: Claude Haiku 4.5 (claude-haiku-4-5-20251001), "The fastest model with near-frontier intelligence", $1 / $5 per MTok, extended thinking, a 200K-token context window, 64K max output, February 2025 reliable knowledge cutoff, July 2025 training data cutoff, retirement not sooner than 15 October 2026.
- [3]90%System Card: Claude Haiku 4.5anthropic.com· Added Sep 28, 2026· 22% of score
Anthropic's[1][4] system card: Haiku 4.5 was trained on public internet data up to February 2025, and its safety testing supports release under the AI Safety Level 2 (ASL-2) standard.
- [4]90%Claude Haiku 4.5anthropic.com· Added Sep 28, 2026· 22% of score
Anthropic's[1][3] Haiku model page: Haiku 4.5 is on Claude[2].ai (web, iOS, Android), the Claude Platform, Amazon Bedrock, Google Cloud's Vertex AI, Microsoft Foundry and Claude Code; pricing starts at $1 per million input and $5 per million output tokens, with up to 90% savings from prompt caching and 50% from batch processing.
- [5]85%Anthropic launches Claude Haiku 4.5, a smaller, cheaper AI modelcnbc.com· Published Oct 15, 2025· Starts Oct 15, 2025· 6% of score
CNBC (published 2025-10-15T17:00Z): "Anthropic[1][3][4] on Wednesday announced Claude[2] Haiku 4.5", available to free users and now the cheapest model for paid users; it is better at using computers than Sonnet 4, and CPO Mike Krieger says "It punches way above its weight".
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