Models and pricesAnthropic
Claude Opus 5.5: Fable-level work for less than half the price
Anthropic released Claude Opus 5.5 on September 22 with a 1M-token context window and up to 128k output tokens. The API costs $4 input and $20 output per million tokens (Opus 5: $5 / $25; the larger Fable 5.1: $10 / $50), and Anthropic says Opus 5.5 performs at the level of Fable 5.1 on most work. A tester at Clio reports that the model stayed on task for more than 18 hours, unattended, on an overnight job spanning six code repositories.
$4 / $20 per 1M tokens (Fable 5.1: $10 / $50) · Terminal-Bench 4.0: 66.4% vs 55.8% for Fable 5.1 (Anthropic) · 18+ hours unattended on one task (tester report)
Why it matters, try it, sources
Why it matters
Anthropic says typical workloads cost about 40% less than with Opus 5, and five-hour limits went up on Pro, Max, Team and seat-based Enterprise plans; the independent Artificial Analysis index currently ranks Opus 5.5 first. For long agent runs, the work now lies mostly in setting clear checks and reviewing the results.
Try it
claude.ai from the Pro plan ($20 per month, $17 billed annually, US list prices), Claude Code, and the API as claude-opus-5-5, also via AWS Bedrock, Google Cloud and Microsoft Foundry. Austria is a supported API region. The faster Fast mode (up to 2.5x speed, $8 / $40 per 1M tokens) left research preview on October 15.




