Claude Haiku 5.5 — Specifications
Compiled by Mustafa Ihsan from the vendor’s published documentation · Last updated
| Developer | Anthropic |
|---|---|
| Type | Fast / high-volume |
| Modality | Text, vision |
| Parameters | Undisclosed |
| Context window | 1M |
| Max output | 128K |
| License | Proprietary |
| Open weights | No |
| Released | 2026-10 |
| Input price | $0.10 /1M |
| Output price | $0.50 /1M |
| API providers | Anthropic API, AWS, Google Cloud, Microsoft Azure |
Benchmarks
| Anthropic-reported | GDPval-AA v2.1 1620 Elo; OSWorld 2.1 (offline subset) 72.4%; Humanity's Last Exam 45.9% (no tools), 57.4% (with tools); Terminal-Bench 4.0 39.2%; FrontierCode 1.1 (Main) 46.4%. Prices shown are for prompts up to 100K tokens; $0.50 / $2.50 above that. |
|---|
What is Claude Haiku 5.5?
Claude Haiku 5.5 is Anthropic’s smallest and fastest current model, released on 7 October 2026 as the third model of the Claude 5.5 family, after Opus 5.5 and Sonnet 5.5. According to Anthropic, it is built for high-volume, cost-sensitive work such as classification, extraction, summaries, quick lookups, live customer support and sub-agent tasks next to Opus 5.5 or Sonnet 5.5. It is the first Haiku model with an adjustable effort setting.
Pricing depends on prompt length. For prompts up to 100,000 tokens it costs $0.10 per million input tokens and $0.50 per million output tokens; above 100,000 tokens it costs $0.50 and $2.50. Cache reads are $0.01 per million (up to 100K). That is far below Claude Haiku 4.5 ($1 / $5): Anthropic says Haiku 5.5 costs around 75% less on average, even though its newer tokenizer counts about 30% more tokens for the same text. Full rates are on Anthropic’s pricing page.
It has a 1M-token context window and up to 128K output tokens, and is available on the Claude API as claude-haiku-5-5 and on AWS, Google Cloud and Microsoft Azure. Anthropic’s announcement does not say whether the Claude apps’ free plan uses it. For harder agentic coding, Anthropic still points to Sonnet 5.5 and Opus 5.5; see Claude Sonnet 5.5 and Claude Opus 5.5, or estimate a monthly bill with the AI API cost calculator.
Claude Haiku 5.5 pricing: API cost per 1M tokens
| Input (per 1M tokens) | $0.100 |
|---|---|
| Output (per 1M tokens) | $0.500 |
| Output/input ratio | 5× |
| Blended (4:1 in:out) | $0.180 per 1M tokens |
What Claude Haiku 5.5 costs per month
Real monthly spend at a 4:1 input-to-output mix — the ratio a typical chat or RAG workload actually produces.
| Workload | Tokens / month | Cost / month |
|---|---|---|
| Side project | 1M in / 0.25M out | $0.23 |
| Small team | 20M in / 5M out | $4.50 |
| Production | 200M in / 50M out | $45 |
Run your own numbers in the AI API cost calculator.
Cheaper alternatives to Claude Haiku 5.5
| Model | Blended $/1M | You save |
|---|---|---|
| Mistral 7B open | $0.0220 | 88% cheaper |
| Llama 3.1 8B open | $0.0220 | 88% cheaper |
| Mistral NeMo 12B open | $0.0240 | 87% cheaper |
Frequently asked questions
How much does Claude Haiku 5.5 cost per 1M tokens?
Claude Haiku 5.5 costs $0.100 per 1M input tokens and $0.500 per 1M output tokens. At a typical 4:1 input-to-output mix that blends to about $0.180 per 1M tokens.
How much does Claude Haiku 5.5 cost per month?
A small-team workload of 20M input and 5M output tokens a month costs about $4.50 on Claude Haiku 5.5. A side project (1M in / 0.25M out) costs roughly $0.23.
What is a cheaper alternative to Claude Haiku 5.5?
Mistral 7B is the strongest cheaper option in our database at $0.0220 per 1M blended — about 88% less than Claude Haiku 5.5. It is also open-weight, so self-hosting is an option.
Can I run Claude Haiku 5.5 locally?
No. Claude Haiku 5.5 is a closed, API-only model — the weights are not released, so it cannot be self-hosted.
Why does Claude Haiku 5.5 charge more for output than input?
Output tokens are generated one at a time and cannot be batched the way a prompt can, so they cost the provider more to serve. Claude Haiku 5.5 charges 5× more for output, which is why prompt-heavy workloads are far cheaper to run than generation-heavy ones.
See every Claude model priced side by side: Claude API pricing.
Prices are the published list rates for the model's primary API and are reviewed as providers change them. Volume, batch and cached-input discounts are not included. Compare every model side by side in the AI models database or the LLM leaderboard.