// ranked · October 2026
Best LLM for AI Agents
Ranked by LiveBench’s long-horizon agentic category: building and operating finance, operations and systems apps over many turns as requirements change — closer to how agents are actually deployed.
Claude Fable 5.1 (77.9) and GPT-6 Astra (77.5) are effectively tied on LiveBench long-horizon agentic — less than a point apart, which effort settings alone can move. Claude Opus 5.5 follows at 72.8.
Claude Fable 5.1 vs GPT-6 Astra, head to headBest value in the top 10
DeepSeek V4.1 Flash 1017
Lowest measured cost per point among the leaders — $0.0353 per point for a score of 40.9.
Best under $1.00 / 1M
DeepSeek V4.1 Flash 1017
Highest score at a blended list price of $1.00 per 1M tokens or less — 40.9 at $0.262.
Top 10
| # | Model | Long-horizon agentic score | Blended / 1M | Context | Capabilities |
|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 anthropic/claude-fable-5.1 | 77.9 | $20.00 | 1M | reasoningtoolsvision |
| 2 | GPT-6 Astra openai/gpt-6-astra | 77.5 | $20.00 | 1.1M | reasoningtoolsvision |
| 3 | Claude Opus 5.5 anthropic/claude-opus-5.5 | 72.8 | $8.00 | 1M | reasoningtoolsvision |
| 4 | GPT-6.1 Sol openai/gpt-6.1-sol | 68.7 | $4.00 | 1.1M | reasoningtoolsvision |
| 5 | Claude Sonnet 5.5 anthropic/claude-sonnet-5.5 | 63.4 | $4.00 | 1M | reasoningtoolsvision |
| 6 | Gemini 4 Argon google/gemini-4-argon | 61.2 | $4.00 | 1.0M | reasoningtoolsvision |
| 7 | Muse Wonder meta/muse-wonder | 52.6 | $8.00 | 1.0M | reasoningtoolsvision |
| 8 | GPT-6.1 Terra openai/gpt-6.1-terra | 48.6 | $2.00 | 1.1M | reasoningtoolsvision |
| 9 | SpaceXAI: Grok 4.7 x-ai/grok-4.7 | 46.1 | $3.00 | 500K | reasoningtoolsvision |
| 10 | DeepSeek V4.1 Flash 1017 deepseek/deepseek-v4.1-flash-1017 | 40.9 | $0.262 | 1.0M | reasoningtoolsvision |
18 more models qualify — see the full leaderboard.
FAQ
What is the best LLM for AI Agents in October 2026?
Claude Fable 5.1 (77.9) and GPT-6 Astra (77.5) are effectively tied on LiveBench long-horizon agentic — less than a point apart, which effort settings alone can move. Claude Opus 5.5 follows at 72.8.
What is the best value in the top 10 for long-horizon agentic?
DeepSeek V4.1 Flash 1017. Lowest measured cost per point among the leaders — $0.0353 per point for a score of 40.9.
What is the best under $1.00 / 1m for long-horizon agentic?
DeepSeek V4.1 Flash 1017. Highest score at a blended list price of $1.00 per 1M tokens or less — 40.9 at $0.262.
How is this ranking produced?
Ranked by LiveBench’s long-horizon agentic category: building and operating finance, operations and systems apps over many turns as requirements change — closer to how agents are actually deployed.
Other rankings
How this ranking is produced
- One metric, stated above — nothing here is weighted or scored by us. Scores come from LiveBench release 2026-10-25; models without a published run don't appear in score-based rankings.
- Price, context and capabilities — live from OpenRouter, refreshed every 15 minutes.
- Ties — scores less than a point apart are called a tie; effort settings alone move a LiveBench score by more than that.
A public benchmark is someone else's workload. Before committing, see LLM & agent evaluation.