LLM Comparison
Claude Sonnet 5 vs Claude Sonnet 5.5
Side-by-side specs, pricing & capabilities · Updated September 2026
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2/6 models| Organization | ||
| OpenTools Score | 63 10.5 | |
| Family | Claude Sonnet | Claude Sonnet |
| Status | Current | Current |
| Release Date | Jun 2026 | Sep 2026 |
| Context Window | 1.0M tokens | 1.0M tokens |
| Input Price | $2.00/M tokens | $2.00/M tokens |
| Output Price | $10.00/M tokens | $10.00/M tokens |
| Pricing Notes | Claude API standard pricing is $2 input and $10 output per million tokens. Cache reads are $0.20, 5-minute cache writes $2.50, and 1-hour cache writes $4 per million tokens. Batch API input/output receives a 50% discount. Current official documentation lists these rates without the previously recorded August 31 introductory expiry; provider-specific rates may differ. | Anthropic Claude API standard tier, USD per million tokens: $2 input, $10 output; 5-minute cache writes $2.50, 1-hour cache writes $4, cache reads $0.20. Batch API gives 50% off input and output. A 300K output limit is available only for Message Batches API with the output-300k-2026-03-24 beta header; standard maximum output is 128K. Provider and regional terms may vary. |
| Capabilities | textvisionreasoningcodingtool-useextended-thinkingagents | textvisionreasoningcodingtool-uselong-contextcontext-caching |
| Training Cutoff | — | 2026-06 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-sonnet-5 | claude-sonnet-5-5 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 53artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3 | 38https://artificialanalysis.ai/models/claude-sonnet-5 | — |
| GPQA Diamond | 91.1111artificial-analysis | — |
| SciCode | 54.2824artificial-analysis | — |
| Terminal-Bench 2.1 | 80.5243artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3.2 | — | 55.9779549012591artificial-analysis |
| View Claude Sonnet 5 | View Claude Sonnet 5.5 | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Sonnet 5Cheapest | $2.00 | $5.00 | $7.00 | — |
| Claude Sonnet 5.5Cheapest | $2.00 | $5.00 | $7.00 | — |
Anthropic
Claude Sonnet 5
Claude Sonnet 5 is Anthropic next-generation Sonnet model and a drop-in upgrade from Sonnet 4.6. Anthropic docs state that adaptive thinking is on by default, manual extended thinking is removed, sampling parameter overrides return errors, and the model supports a 1M token context window with 128K max output.
Anthropic
Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's proprietary adaptive-reasoning model. The Claude API identifier is claude-sonnet-5-5. It accepts text and images, returns text, has a 1,000,000-token context window and a 128,000-token standard output limit. Anthropic lists standard API input and output pricing at $2 and $10 per million tokens.
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