Claude Sonnet 5.5
By Anthropic · released 2026-09-28 (3 weeks) · 5 effort levels
1 of 5 on the frontier at launchOff the frontier todayproprietary
- Intelligence index
- 35.90–56.00
- Cost to run the AA index
- $482–$7260
- Price per 1M tokens (in / out)
- $2.00 / $10.0
Today
Where Claude Sonnet 5.5 stands on the 2026-10-24 frontier
No measured level is on the frontier today.
| Level | Input modalities | Intelligence | Cost | E2E | Today | Matchup |
|---|---|---|---|---|---|---|
| Claude Sonnet 5.5 (Low, Default Fallback) | Text, Image | 35.90 | $482 | 6.19s | beaten by GPT-6.1 Sol (Medium) | Compare |
| Claude Sonnet 5.5 (Medium, Default Fallback) | Text, Image | 40.80 | $622 | 6.26s | beaten by GPT-6.1 Sol (High) | Compare |
| Claude Sonnet 5.5 (High, Default Fallback) | Text, Image | 46.80 | $1027 | 14.9s | beaten by GPT-6.1 Sol (Xhigh) | Compare |
| Claude Sonnet 5.5 (Xhigh, Default Fallback) | Text, Image | 51.90 | $2177 | 32.1s | beaten by Claude Opus 5.5 (High, Default Fallback) | Compare |
| Claude Sonnet 5.5 (Max, Default Fallback) | Text, Image | 56.00 | $7260 | 360.5s | beaten by Claude Opus 5.5 (Xhigh, Default Fallback) | Compare |
Claude Sonnet 5.5 effort levelsToday's Pareto frontierEvery other model
Matchup
Compare head to head
Suggested: what beats it, its effort levels, and frontier models near its price.
- Claude Sonnet 5.5 (Max, Default Fallback) vs Claude Opus 5.5 (Xhigh, Default Fallback)
- Claude Sonnet 5.5 (Max, Default Fallback) vs Claude Opus 5.5 (Max, Default Fallback)
- Claude Sonnet 5.5 (Max, Default Fallback) vs Claude Sonnet 5.5 (Low, Default Fallback)
- Claude Sonnet 5.5 (Max, Default Fallback) vs Claude Sonnet 5.5 (Medium, Default Fallback)
- Claude Sonnet 5.5 (Max, Default Fallback) vs Claude Sonnet 5.5 (High, Default Fallback)
- Claude Sonnet 5.5 (Max, Default Fallback) vs Claude Sonnet 5.5 (Xhigh, Default Fallback)
- Claude Sonnet 5.5 (Max, Default Fallback) vs Kimi K3.1 Pro
Launch day
What Claude Sonnet 5.5 did to the frontier on 2026-09-28
Reached the frontier
Claude Sonnet 5.5 (High, Default Fallback)
Reached the frontier1 of 5
Impact (hypervolume gained)0.09
Rank, past year's releases#40 of 46
Smartest level56.00
Cheapest level$482
Reached the frontierMissed itDisplaced from the old frontierFrontier the day beforeFrontier after the releaseRegion gained (impact)
Missed the frontier
| Level | Intelligence | Cost | Beaten by | Intel gap | Cost ratio |
|---|---|---|---|---|---|
| Claude Sonnet 5.5 (Low, Default Fallback) | 35.90 | $482 | MiMo-V2.6-Flash | −2.0 | 4.40× |
| Claude Sonnet 5.5 (Medium, Default Fallback) | 40.80 | $622 | MiMo-V2.6-Pro | −5.5 | 3.01× |
| Claude Sonnet 5.5 (Xhigh, Default Fallback) | 51.90 | $2177 | Claude Opus 5.5 (High, Default Fallback) | −1.7 | 1.00× |
| Claude Sonnet 5.5 (Max, Default Fallback) | 56.00 | $7260 | Claude Opus 5.5 (Xhigh, Default Fallback) | −0.0 | 1.79× |
Agents:
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