Best LLM for tool calling
- models ranked
- 120
- lead over #2
- +2.4
Overall index · read October 22
As of October 22, 2026, Anthropic Claude Opus 5.5 leads 120 models that qualify, with 87.1 on the overall index, ahead of Anthropic Claude Fable 5.1 (84.7) and Google Gemini 4 Argon (84.0).
| Rank | Model | Overall index | Evidence | Coding index | Output $/Mtok |
|---|---|---|---|---|---|
| 1 | Claude Opus 5.5 Anthropic | 87.1 | 88.8 | $20.00 | |
| 2 | Claude Fable 5.1 Anthropic | 84.7 | 84.2 | $50.00 | |
| 3 | Gemini 4 Argon Google | 84.0 | 81.0 | $10.00 | |
| 4 | GPT-6 Astra OpenAI | 83.0 | 85.1 | $50.00 | |
| 5 | Claude Sonnet 5.5 Anthropic | 82.8 | 87.3 | $10.00 | |
| 6 | Claude Opus 5 Anthropic | 81.6 | 83.0 | $25.00 | |
| 7 | GPT-6.1 Sol OpenAI | 81.4 | 82.4 | $10.00 | |
| 8 | Claude Fable 5 Anthropic | 79.0 | 79.3 | $50.00 | |
| 9 | GPT-5.6 Sol OpenAI | 74.7 | 73.5 | $20.00 | |
| 10 | GPT-6 Sol OpenAI | 74.6 | 76.0 | $10.00 | |
| 11 | Claude Opus 4.7 Anthropic | 71.6 | 67.5 | $25.00 | |
| 12 | Claude Opus 4.8 Anthropic | 69.8 | 65.0 | $25.00 | |
| 13 | GPT-5.4 OpenAI | 69.6 | 64.4 | $15.00 | |
| 14 | GPT-5.5 OpenAI | 69.2 | 71.3 | $30.00 | |
| 15 | Gemini 3.8 Flash Google | 69.0 | 61.6 | $3.75 | |
| 16 | Qwen3.8 Max (0902) Qwen | 68.9 | 62.4 | $6.00 | |
| 17 | Muse Spark 1.3 Meta | 68.6 | 57.4 | $4.25 | |
| 18 | MiMo-V2.6-Pro Xiaomi | 68.4 | 65.4 | $0.87 | |
| 19 | Gemini 3.6 Flash Google | 68.3 | 62.5 | $3.75 | |
| 20 | GPT-5.6 Terra OpenAI | 68.1 | 63.9 | $12.00 |
How this list is built
Generated from the dataset on every refresh. Nobody picks the order by hand.
Models whose OpenRouter listing supports tools, ordered by the LLMBenchmark Index, highest first. The index is our own 0 to 100 composite of our five skill indexes, the Artificial Analysis Intelligence Index and the LMArena text Elo, with a 90% margin.
- OpenRouter, fetched
- LMArena WebDev, fetched
- Artificial Analysis (via OpenRouter), fetched