SlackBench - MCP - Circumstance Inference: leaderboard
Agents answer questions across realistic Slack workplace reenactments and associated evolving code repositories. Mean category pass score (%). SlackBench140tasks:58AgenticSearch,48Hallucination,14Summarization,20CircumstanceInference; three runs,20min/query; GPT-5.4 judge. Summarization earns checklist partial credit, other categories binary pass; Overall is the unweighted category mean. Harness, MCP/CLI access and reasoning effort remain separate in row identities. Native first-party model APIs.
Metric: Mean category pass score (%). Source: arxiv.org. Saturation forecast: Rough model projection: around 2026. 33 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Gemini 4 Argon (Benchmark Sweep Run: source=SlackBench; harness=Antigravity; access=MCP; effort=medium) | 83.33 | |
| 2 | Claude Fable 5.1 (Benchmark Sweep Run: source=SlackBench; harness=Claude Code; access=MCP; effort=medium) | 83.33 | |
| 3 | Muse Wonder (Benchmark Sweep Run: source=SlackBench; harness=Muse Code; access=MCP; effort=medium) | 80 | |
| 4 | Muse Wonder (Benchmark Sweep Run: source=SlackBench; harness=Claude Code; access=MCP; effort=medium) | 80 | |
| 5 | Claude Opus 5.5 (Benchmark Sweep Run: source=SlackBench; harness=Claude Code; access=MCP; effort=medium) | 73.33 | |
| 6 | Grok 4.7 (Benchmark Sweep Run: source=SlackBench; harness=Grok Build; access=MCP; effort=medium) | 70 | |
| 7 | Muse Spark 1.3 (Benchmark Sweep Run: source=SlackBench; harness=Muse Code; access=MCP; effort=medium) | 68.33 | |
| 8 | GPT-5.5 (Benchmark Sweep Run: source=SlackBench; harness=Terminus-2; access=MCP; effort=medium) | 66.67 | |
| 9 | Claude Opus 4.6 (Benchmark Sweep Run: source=SlackBench; harness=OpenHands; access=MCP; effort=medium) | 66.67 | |
| 10 | GPT-6.1 Terra (Benchmark Sweep Run: source=SlackBench; harness=Codex CLI; access=MCP; effort=medium) | 61.67 |
Interactive version: theaggregate.ai/benchmark?slug=slackbench-mcp-circumstance-inference · How It Works · Data refreshed daily, snapshot 2026-11-06.