Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) API PricingNEW
Anthropic · released 2026-09-28 · merges 5 reasoning-effort tiers
Benchmarks shown for the highest-scoring reasoning tier. Merged tiers: Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback), Claude Sonnet 5.5 (Adaptive Reasoning, Xhigh Effort, Default Fallback), Claude Sonnet 5.5 (Adaptive Reasoning, High Effort, Default Fallback), Claude Sonnet 5.5 (Adaptive Reasoning, Medium Effort, Default Fallback), Claude Sonnet 5.5 (Adaptive Reasoning, Low Effort, Default Fallback).
Pricing
0.200¢ / 1K
1.00¢ / 1K
0.400¢ / 1K
What it actually costs
| Workload | Tokens | Cost |
|---|---|---|
| Short chat reply | 500 in / 300 out | 0.4¢ |
| RAG query | 4,000 in / 500 out | $0.0130 |
| Long document summary | 50,000 in / 1,000 out | $0.1100 |
| Code review of a 2k-line file | 30,000 in / 2,000 out | $0.0800 |
| 1,000 chat replies/day for 30 days | 30,000 × (500 in / 300 out) | $120.00 |
Cost = (input tokens ÷ 1,000,000 × $2.00) + (output tokens ÷ 1,000,000 × $10.00).
Benchmarks
#2 of 539
Leaderboard neighbours
| Model | Intelligence | Blended $/1M |
|---|---|---|
| Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) | 57.6 | $8.00 |
| Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) | 56.0 | $4.00 |
| Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) | 53.4 | $20.00 |
| GPT-6 Astra (max) | 52.7 | $20.00 |
| Claude Opus 5 (Adaptive Reasoning, Max Effort) | 50.8 | $10.00 |
More from Anthropic
| Model | Intelligence | Blended $/1M |
|---|---|---|
| Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) | 57.6 | $8.00 |
| Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) | 53.4 | $20.00 |
| Claude Opus 5 (Adaptive Reasoning, Max Effort) | 50.8 | $10.00 |
| Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) | 49.6 | $20.00 |
| Claude Opus 4.8 (Adaptive Reasoning, Max Effort) | 41.8 | $10.00 |
| Claude Opus 4.7 (Adaptive Reasoning, Max Effort) | 40.7 | $10.00 |
| Claude Sonnet 5 (Adaptive Reasoning, Max Effort) | 38.2 | $4.00 |
| Claude Opus 4.6 (Adaptive Reasoning, Max Effort) | 31.9 | $10.00 |
Count tokens & estimate cost for Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) See Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) on the leaderboard
Source: Artificial Analysis · last synced 2026-09-29
FAQ
Who develops Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)?
Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) is developed by Anthropic, released 2026-09-28.
How much does Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) cost per million tokens?
Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) costs $2.00 per 1M input tokens and $10.00 per 1M output tokens ($4.00 blended), per Artificial Analysis's official pricing data.
How does Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) rank on benchmarks?
Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) scores 56.0 on the Artificial Analysis Intelligence Index, ranking #2 of 539 models we track.
Where does this data come from?
Pricing and benchmark data for Claude Sonnet 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) comes from Artificial Analysis (artificialanalysis.ai), synced daily. Last synced 2026-09-29.