# Claude Haiku 5.5

Claude Haiku 5.5 is an AI model released by Anthropic on Oct 7 2026. It has a 1M context window. Tracked results include 72.4% on OSWorld 2.1 (offline), 57.4% on Humanity's Last Exam (with tools) and 46.4% on FrontierCode v1.1 (Main) (main split).

## Facts

| Field | Value |
| --- | --- |
| Model | Claude Haiku 5.5 |
| Developer | Anthropic |
| Release date | Wednesday, Oct 7 2026 |
| Licensing | Closed |
| Context window | 1M |

## 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 |
| --- | --- | --- | --- | --- | --- |
| Up to 100K input tokens | $0.10 | $0.01 | $0.125 | $0.20 | $0.50 |
| Over 100K input tokens | $0.50 | $0.05 | $0.625 | $1.00 | $2.50 |

Anthropic said it costs around 75% less to run than Haiku 4.5 on average.
Verified October 7, 2026 against the first-party source: https://platform.claude.com/docs/en/about-claude/pricing

## Tracked benchmark scores

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| FrontierCode v1.1 (Main) (main split) | 46.4% | Lab | A set of very hard, frontier-difficulty coding tasks an AI agent has to complete end to end. The score is the share of tasks in the main split it solves. Higher is better. |
| Terminal-Bench 4.0 | 39.2% | Lab | Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Version 4.0 recalibrated how much time, CPU and memory each task gets, removed eight tasks and fixed nineteen, so fewer runs fail for reasons that have nothing to do with the model. Scores are not comparable with earlier versions. Higher is better. |
| Humanity's Last Exam (no tools) | 45.9% | Lab | Humanity's Last Exam — extremely hard expert questions across many subjects, written so you can't just look up the answer. “No tools” means the AI answers on its own. Higher is better. |
| Humanity's Last Exam (with tools) | 57.4% | Lab | Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. |
| OSWorld 2.1 (offline) | 72.4% | Lab | Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Version 2.1, in its offline setting. Scores are not comparable with version 2.0. Higher is better. |
| GDPval-AA v2.1 | 1620 | Lab | economically valuable knowledge work (v2.1, Crowd-BT Elo fit) |
| AA-Briefcase v1.1 | 1578 | Lab | Artificial Analysis agentic office-work eval (Elo, v1.1 rating fit) |
| Chartography (no tools) | 46.4% | Lab | The same chart-centred test with no tools: the AI has to read each chart unaided. Scores run far lower than the with-tools version, so read the two as separate tests. Higher is better. |

## About Claude Haiku 5.5

Claude Haiku 5.5, released October 7, 2026, completed Anthropic's 5.5 generation nine days after Claude Sonnet 5.5 and fifteen after Claude Opus 5.5, and was the first new Haiku in almost a year. The headline was price. For prompts up to 100,000 tokens it cost $0.10 per million input tokens and $0.50 per million output, a tenth of Haiku 4.5's $1 and $5, with cache reads at $0.01; past 100,000 tokens the rates rose to $0.50 and $2.50, still half of Haiku 4.5's. The entry tier matched the price of OpenAI's GPT-6 Luna, and Anthropic said the model cost around 75% less to run than Haiku 4.5 on average. It was pitched at high-volume, latency-sensitive work such as classification, extraction, routing and subagent tasks, and shipped with a 1-million-token context window, 128,000 tokens of maximum output, adaptive thinking at a default of medium effort and a June 2026 knowledge cutoff.

The launch table put it far ahead of its predecessor on agentic work: 39.2% on Terminal-Bench 4.0 against Haiku 4.5's 0.0%, 72.4% on OSWorld 2.1 in its offline setting against 15.7%, and a GDPval-AA v2.1 Elo of 1620 against 735. It scored 45.9% on Humanity's Last Exam without tools and 57.4% with them, 46.4% on FrontierCode 1.1, and 46.4% on Chartography without tools against Haiku 4.5's 6.4%. Against GPT-6 Luna it led on every benchmark the table reported for both, including Terminal-Bench 4.0, where Luna scored 16.4%, and OSWorld 2.1, where it scored 48.9%; Sonnet 5.5 stayed well ahead, most of all on Terminal-Bench 4.0 at 70.6%. Anthropic reported far fewer instances of misaligned behaviour than in Haiku 4.5, with cyber safeguards stricter than Haiku 4.5's. At launch it was available in the Claude apps, through Anthropic's API as claude-haiku-5-5, and on Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS.

## Questions and answers

### When was Claude Haiku 5.5 released?

Claude Haiku 5.5 was released by Anthropic on Wednesday, Oct 7 2026.

### Who made Claude Haiku 5.5?

Claude Haiku 5.5 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 5.5 cost?

Claude Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens through the Anthropic API. Cached input is $0.01 per million tokens. Those are the rates for the “Up to 100K input tokens” tier; 1 other pricing tier is published for this model. Rates are pay-as-you-go API prices verified against Anthropic's published pricing on October 7, 2026.

### What benchmark scores did Claude Haiku 5.5 get?

Claude Haiku 5.5 reports 8 tracked benchmark scores — FrontierCode v1.1 (Main) (main split): 46.4%; Terminal-Bench 4.0: 39.2%; Humanity's Last Exam (no tools): 45.9%; Humanity's Last Exam (with tools): 57.4%; OSWorld 2.1 (offline): 72.4%; GDPval-AA v2.1: 1620; AA-Briefcase v1.1: 1578; Chartography (no tools): 46.4%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data. It holds the best score among all models tracked here on OSWorld 2.1 (offline).

### What is the context window of Claude Haiku 5.5?

Claude Haiku 5.5 has a context window of 1M. That is the maximum amount of input plus output the model can hold in a single request.

### Is Claude Haiku 5.5 open source?

No. Claude Haiku 5.5 is a closed 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 5.5?

Anthropic's previous tracked release was Claude Sonnet 5.5 on Sep 28 2026, 9 days earlier. It is the most recent Anthropic model tracked on AI Release Tracker.


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Canonical page: https://aireleasetracker.com/model/anthropic/claude-haiku-5.5
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.