What is the LMArena Agent benchmark?
LMArena's Agent board evaluates models running multi-step agentic sessions with tools; scores are the published win share with its official interval, per evaluated configuration. It is published by LMArena.
Benchmark leaderboard
LMArena Agent leaderboard
LMArena's Agent board evaluates models running multi-step agentic sessions with tools; scores are the published win share with its official interval, per evaluated configuration. This page lists every model ModelCap tracks with a published LMArena Agent result, its best evaluated configuration, the source's own rank, and the model's ModelCap Index position, API price and context window.
Snapshot as of 6 August 2026
Claude Opus 5 from Anthropic leads the LMArena Agent leaderboard among the 34 tracked models with 12.0% (High configuration), per the source snapshot published 6 August 2026.
Tracked models with a result
34
Entries on the source board
46
Open-weight models listed
5
LMArena Agent standings (34 models)
Sorted by published score, one row per model. Source: LMArena.
How ModelCap uses LMArena Agent
LMArena Agent ranks models by agentic session score. ModelCap ingests the board as published, matches each entry to a catalogue model with a reviewed identity, and shows the source's score, interval and rank unchanged. Where a model has an admitted result, it feeds the ModelCap Index as agent evidence alongside the other public boards; the methodology documents the weighting and the identity rules.
LMArena Agent leaderboard: common questions
Which AI model leads LMArena Agent right now?
Claude Opus 5 (Anthropic) holds the top LMArena Agent score among the models ModelCap tracks, at 12.0% as of the source snapshot published 6 August 2026.
How many models are ranked on the LMArena Agent leaderboard here?
34 tracked models have a published LMArena Agent result on ModelCap; the source board itself lists 46 entries. Each row shows the model's best evaluated configuration.
What is the best open-weight model on LMArena Agent?
GLM 5.2 from Z.ai is the highest-scoring model with openly downloadable weights on this board, at 6.8%.
Which model offers the best value on LMArena Agent?
Among the ten highest-scoring priced models, GLM 5.2 has the lowest listed output price at $2.42 per 1M tokens while scoring 6.8%.
How is LMArena Agent scored?
The board ranks models by agentic session score; higher scores are better. ModelCap shows the source's own score, interval and rank and never re-runs the evaluation.
Does LMArena Agent decide the ModelCap Index rank?
Not on its own. The ModelCap Index combines several public capability sources with published uncertainty; LMArena Agent contributes as agent evidence where a model has an admitted result. The methodology page documents the weighting.
How recent are the LMArena Agent results?
The newest LMArena Agent publication ModelCap holds is dated 6 August 2026. The page re-renders every minute from the sealed dataset, so it reflects the latest refresh of the source board.
Explore further
- AI model rankingsThe live ModelCap Index across every board
- All benchmark leaderboards7 public boards
- MethodologyHow boards become the ModelCap Index
- Claude Opus 5 vs Claude Fable 5Head-to-head on LMArena Agent, price and context
- Claude Opus 5 vs GPT-5.6 SolHead-to-head on LMArena Agent, price and context
- Claude Opus 5 vs Kimi K3Head-to-head on LMArena Agent, price and context
- Claude Fable 5 vs GPT-5.6 SolHead-to-head on LMArena Agent, price and context
- Anthropic modelsPublisher of the LMArena Agent leader