Updated
Claude Opus 5.5
As of Nov 9, 2026, Claude Opus 5.5 ranks #6 of 7 on Bug Bench with a relative bug rate of 1.11 (11% more counted bugs than average), statistically tied with Claude Sonnet 5.5.
- Relative bug rate
- 1.11
- Rank of 7
- #6
- Tied with
- Claude Sonnet 5.5
1.00 = average · lower is better
- Provider
- Anthropic
- Released
- Sep 22, 2026
- Price per 1M tokens
- $4 in · $20 out
- First seen
- Week of Sep 21
Nearby in the ranking
| Rank | Model | Rate |
|---|---|---|
| 4 | GPT-6 Astra | 0.95 |
| 5= (statistically tied) | Claude Sonnet 5.5 | 1.04 |
| 6 | Claude Opus 5.5 | 1.11 |
| 7 | Grok 4.7 | 1.61 |
Compared with Claude Opus 5
Claude Opus 5.5 ranks #6 at 1.11; Claude Opus 5 is no longer ranked because it now writes under 0.5% of AI-attributed lines. Claude Opus 5.5 vs Claude Opus 5
Is Claude Opus 5.5 getting worse?
Not enough weekly data yet (0 of 6 weeks).
Where it does better or worse
# = rank among models
By coding agent
| Rank | Agent | Rate |
|---|---|---|
| 3 | Claude Code | 1.09 |
| 2 | Cursor | 2.47 |
How widely Claude Opus 5.5 is used
Share of AI-written code reviewed by cubic
- Latest weekWeek of Nov 2
- 66.2%
- Peak weekWeek of Nov 2
- 66.2%
Compare Claude Opus 5.5
Questions and answers
- Is Claude Opus 5.5 good for coding?
- Claude Opus 5.5 ranks #6 of 7 on Bug Bench, with 11% more counted bugs than average (1.11) from Jul 20 to Nov 8, 2026.
- Is Claude Opus 5.5 getting worse?
- Not enough weekly data yet (0 of 6 weeks).
- Which coding agent has the lowest bug rate with Claude Opus 5.5?
- Claude Code (1.09), ahead of Cursor (2.47).
- How does Claude Opus 5.5 compare to Claude Opus 5?
- Claude Opus 5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
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