# Claude Haiku 4.5

Claude Haiku 4.5 is an AI model released by Anthropic on Oct 15 2025. Tracked results include 77% on BullshitBench v2, 73% on GPQA Diamond and 73.3% on SWE-Bench Verified.

## Facts

| Field | Value |
| --- | --- |
| Model | Claude Haiku 4.5 |
| Developer | Anthropic |
| Release date | Wednesday, Oct 15 2025 |
| Licensing | Proprietary |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Cached input | 5 min cache write | 1 hr cache write | Output |
| --- | --- | --- | --- | --- | --- |
| All documented contexts | $1.00 | $0.10 | $1.25 | $2.00 | $5.00 |

Verified August 18, 2026 against the first-party source: https://platform.claude.com/docs/en/about-claude/pricing

## Tracked benchmark scores

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| BullshitBench v2 | 77% | [BullshitBench](https://github.com/petergpt/bullshit-benchmark) | 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. |
| ProgramBench | 0% | [ProgramBench](https://programbench.com/), retrieved 2026-09-11 | The AI receives a working program and its documentation, then builds a replacement from scratch without the original source code, internet access or decompilation. The score is the percentage of 200 programs that pass every behavioral test. We record each model's best published mini-SWE-agent result, including higher reasoning efforts where available. Partial test-pass rates and almost-solved programs do not count toward this score. Equal scores share a rank here; the official board also uses partial progress to break ties. Higher is better. |
| SWE-Bench Verified | 73.3% | Lab | 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. |
| GPQA Diamond | 73% | Lab | Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. |

## About Claude Haiku 4.5

Claude Haiku 4.5, released October 15, 2025, brought near-frontier coding to Anthropic's smallest, fastest tier. It scored 73.3% on SWE-Bench Verified — essentially matching Claude Sonnet 4, the mid-tier flagship from just five months earlier — at roughly a third of the cost and more than twice the speed.

That price-performance profile made Haiku 4.5 a popular choice for high-volume production workloads: sub-agents in orchestration systems, code review at scale, chat products with tight latency budgets. It also posted 73.0% on GPQA Diamond, territory that had belonged exclusively to flagship models a year earlier.

## Questions and answers

### When was Claude Haiku 4.5 released?

Claude Haiku 4.5 was released by Anthropic on Wednesday, Oct 15 2025.

### Who made Claude Haiku 4.5?

Claude Haiku 4.5 was built by Anthropic. AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.

### How much does Claude Haiku 4.5 cost?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens through the Anthropic API. Cached input is $0.10 per million tokens. Rates are pay-as-you-go API prices verified against Anthropic's published pricing on August 18, 2026.

### What benchmark scores did Claude Haiku 4.5 get?

Claude Haiku 4.5 reports 4 tracked benchmark scores — BullshitBench v2: 77%; ProgramBench: 0%; SWE-Bench Verified: 73.3%; GPQA Diamond: 73%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

### Is Claude Haiku 4.5 open source?

No. Claude Haiku 4.5 is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after Claude Haiku 4.5?

Anthropic's previous tracked release was Claude Sonnet 4.5 on Sep 29 2025, 16 days earlier. It was followed by Claude Opus 4.5 on Nov 24 2025.


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Canonical page: https://aireleasetracker.com/model/anthropic/claude-haiku-4.5
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.