Anthropic · Released Oct 7, 2026Claude Haiku 5.5
Fast Claude model for responsive assistance, classification, and lightweight agents.
- Capability
- 160.4ECI · #14 of 165
- Input
- $0.10per 1M tokens
- Output
- $0.50per 1M tokens
- Context
- 1M128K max output
What it costs
- Input
- $0.10per million tokens
- Output
- $0.50per million tokens
- Cached input
- $0.01per million tokens
- Cache write
- $0.125per million tokens
- Over 100K tokens
- $0.50 / $2.50input / output per million
- Blended (3:1)
- $0.20cheaper than 76% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $0.45 |
| Team assistant25M input + 5M output tokens | $5.00 |
| Production app250M input + 50M output tokens | $50.00 |
Official Anthropic API price, as listed on models.dev.
Independent benchmarks
#14 of 165 scored models
The shaded band is Epoch AI’s confidence range (157.3–163.8); the tick marks the median scored model.
Scores from Epoch AI, run independently of Anthropic.
The details
- Lab
- Anthropic
- Released
- Oct 7, 2026
- Knowledge cutoff
- Jun 2026
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high · xhigh · max
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
claude-haiku-5-5on Anthropic- Availability
- 33 API providerslisted on models.dev
What Anthropic claims
Published by the lab at launch. Settings vary, so compare these only with care.
More from Anthropic
About Claude Haiku 5.5
How much does Claude Haiku 5.5 cost?
Claude Haiku 5.5 costs $0.10 input / $0.50 output per million tokens (official Anthropic API price). Cached input is $0.01 per million tokens, and writing to the cache costs $0.125. Requests over 100K tokens are billed at $0.50 input / $2.50 output. At a 3:1 input-to-output mix that is $0.20 per million tokens, cheaper than 76% of the 445 priced models we track.
What is the context window of Claude Haiku 5.5?
Claude Haiku 5.5 accepts up to 1,000,000 tokens per request and can write up to 128,000 tokens in one response.
How good is Claude Haiku 5.5?
Epoch AI gives Claude Haiku 5.5 a Capabilities Index score of 160.4 (likely range 157.3–163.8), ranking it #14 of 165 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 89.7%, FrontierMath Tiers 1–3 75.1%, OTIS Mock AIME 2024–2025 98.9%, SimpleQA Verified 23.8%.
Is Claude Haiku 5.5 open source?
No. Claude Haiku 5.5 is proprietary; you use it through Anthropic’s API or partner platforms.
What inputs does Claude Haiku 5.5 support?
Claude Haiku 5.5 accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium, high, xhigh and max effort settings, supports tool calling and can return structured JSON output.
When was Claude Haiku 5.5 released?
Anthropic released Claude Haiku 5.5 on Oct 7, 2026. Its training data runs to Jun 2026.
What are the best alternatives to Claude Haiku 5.5?
The closest current models from other labs on capability, price and release date are DeepSeek V4.1 Flash 1017 (DeepSeek, ECI 158.8, $0.15 / $0.60), GPT-6 Luna (OpenAI, ECI 156.8, $0.10 / $0.50), GLM-5.3-Flash (Z.ai (Zhipu), ECI 153.2, $0.15 / $0.50) and Gemini 3.7 Flash (Google, ECI 158.2, $0.75 / $3.75).