Claude Opus 5 Fast — Retired model
Fast-mode variant of Opus 5 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode
Technical specifications
Frequently Asked Questions
Can I still use the retired Claude Opus 5 Fast model?
No. Claude Opus 5 Fast has been retired and is retained here only as a historical reference. See the active alternatives linked on this page.
Relay integrity checks
- Tested endpoints
- 1 runs
- Independent hosts
- 1
- Model-family fingerprint match
- 100%
- Anomalies detected
- 1 runs
- Data range
- past 90 days
BazaarLink Probe verifies endpoints that claim to serve this model and flags behavior that differs from the reference baseline.
View the full integrity report →Related models and links
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