Anthropic releases Claude Haiku 5.5
Anthropic's Claude Haiku 5.5 costs about 75% less to run than Haiku 4.5 and posts much higher agentic scores, making high-volume subagent, summarization and computer-use workloads far cheaper to run.
Anthropic has released Claude Haiku 5.5, a small model for high-volume, cost-sensitive work such as summarization, compaction, classification, database queries and coding subagent tasks run alongside Opus 5.5 and Sonnet 5.5. The company says it is its fastest model to date.
The largest gains over Haiku 4.5 are on agentic benchmarks. On OSWorld 2.1 (offline subset), the score rose from 15.7% to 72.4%. On Terminal-Bench 4.0 it went from 0.0% to 39.2%, and on Humanity's Last Exam without tools from 10.2% to 45.9%. Anthropic's table shows Haiku 5.5 ahead of OpenAI's GPT-6 Luna on every benchmark where both were scored, including OSWorld (72.4% vs 48.9%) and FrontierCode 1.1 (46.4% vs 42.4%). It still trails Sonnet 5.5 throughout. Anthropic says the larger models remain the better choice for complex agentic coding. Haiku 5.5 is also the first Haiku model with an adjustable effort setting.
Pricing has two tiers. For prompts up to 100,000 tokens, Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens. Above that, it costs $0.50 and $2.50. Haiku 4.5 cost $1.00 and $5.00. Anthropic says about 90% of requests to the previous Haiku fell under the 100k threshold.
Anthropic also announced two other changes:
- Sonnet 5.5 cache reads are halved to $0.10 per million tokens. The company says this cuts the cost of most agentic work by about 20%.
- Monthly API credits are coming this week for subscribers: $100 for Max 5x, $200 for Max 20x and up to $500 pooled for Team.
Haiku 5.5's cybersecurity safeguards are stricter than Haiku 4.5's. They still block penetration testing. The model is available now as claude-haiku-5-5 on the Claude Platform, AWS, Google Cloud and Azure.