Claude Opus 5.5 is Anthropic’s latest Opus model and replaces Opus 5. It sets a new high score on CursorBench, ahead of Fable 5.1, and costs 20% less than Opus 5 per token. We recommend the high thinking variant for the best results.
Strengths¶
- Highest CursorBench score of any model in Cursor at launch, at standard Opus pricing rather than Fable pricing.
- Clearer communication than earlier Opus models. It explains what it did and why without over-elaborating, which makes long agent sessions easier to follow.
- Strong at front-end and UI work. Early testers used it to design and build complete interfaces from scratch.
- Works well as a coordinator for subagents. It delegates cleanly and keeps the parent task on track across long runs.
- Zero Data Retention compatible. Like earlier Opus models, and unlike Fable 5.1, Opus 5.5 has no data-retention requirements for general access. Teams using ZDR with Opus today can keep that setup with Opus 5.5.
Limitations¶
- Still an Opus-tier price. It uses prepaid credit (or the Other Models pool on legacy Cursor plans) faster than Sonnet 5.5 or Composer.
Tools¶
Opus 5.5 has access to all agent tools when used with Cursor including:
Learn more about how tools work and tool calling fundamentals.
Pricing¶
Opus 5.5 is a third-party model, so it isn’t part of the usage included with Cursor plans. On The X Subscription it’s billed at the rates below from your prepaid credit. On legacy Cursor plans it draws from the Other Models pool. All prices are per million tokens.
Opus 5.5 bills at $4 per million input tokens and $20 per million output tokens, down from $5 and $25 for Opus 5. Prompt-cache reads are $0.20 per million tokens (0.05x the input rate), down from 0.10x on Opus 5.
A Fast mode tier (claude-opus-5-5-fast) is available at launch for higher-priority output. On legacy request-based plans, it requires Max Mode. It bills at $8/M input and $40/M output tokens. Use it selectively for time-sensitive or critical work.
Global endpoints use the rates above. Regional and US-only endpoints are priced 10% higher, at $4.40/M input and $22/M output tokens. See Privacy and Data Governance for data residency details.
All Opus 5.5 prompts bill at the base per-token rates in the table above, including when context goes above 300k. There is no separate long-context multiplier for Opus 5.5. Context windows up to 1M tokens use the same rates.
Opus 5.5 supports a thinking variant for deeper reasoning. We recommend using the high thinking variant for the strongest results.
