LLM Comparison
Claude Sonnet 5.5 vs Kimi K3
Side-by-side specs, pricing & capabilities
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2/6 models| Organization | ||
| OpenTools Score | 81 9.0 | |
| Family | Claude Sonnet | Kimi |
| Status | Current | Current |
| Release Date | Sep 2026 | — |
| Context Window | 1.0M tokens | 1.0M tokens |
| Input Price | $2.00/M tokens | $3.00/M tokens |
| Output Price | $10.00/M tokens | $15.00/M tokens |
| Pricing Notes | 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. | Official Kimi pricing lists kimi-k3 at $3.00 per 1M cache-miss input tokens, $0.30 per 1M cache-hit input tokens, and $15.00 per 1M output tokens. Official troubleshooting docs say max_completion_tokens defaults to 131,072 and maximum output length is 1024*1024 minus prompt tokens. |
| Capabilities | textvisionreasoningcodingtool-uselong-contextcontext-caching | textvisionreasoningcodingtool-usestructured-outputjson-modelong-contextagentic |
| Training Cutoff | 2026-06 | — |
| Max Output | 128K tokens | 131K tokens |
| API Identifier | claude-sonnet-5-5 | kimi-k3 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.3.2 | 56 indexartificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3 | — | 43.8 indexartificial-analysis |
| Artificial Analysis Intelligence Index v4.3 | — | 44 indexhttps://artificialanalysis.ai/models/kimi-k3 |
| GPQA Diamond | — | 93.5%artificial-analysis |
| SciCode | — | 59.5%artificial-analysis |
| Terminal-Bench 2.1 | — | 85%artificial-analysis |
| View Claude Sonnet 5.5 | View Kimi K3 | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Sonnet 5.5Cheapest | $2.00 | $5.00 | $7.00 | — |
| Kimi K3 | $3.00 | $7.50 | $10.50 | +50% |
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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.
Moonshot AI
Kimi K3
Kimi K3 is Moonshot AI open-weight 2.8T-parameter flagship model for long-horizon coding, end-to-end knowledge work, reasoning, and native multimodal understanding. Official Kimi documentation lists the API model ID kimi-k3, a 1M-token context window, automatic context caching, tool calls, JSON mode, structured outputs, and always-on reasoning effort controls.
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