Claude Opus 4.6

Pretty great at coding, terminal work.

SWE-bench Verified

pretty great

80.8%

Vendor-reported SWE-bench Verified. See source for evaluation and memorization-screen caveats; harness differs from OpenAI reports.

Source ↗Observed 2026-10-14

Terminal-Bench 2.0

pretty great

65.4%

Vendor-reported. Terminus-2 harness, adaptive thinking at maximum effort, 1 million tokens per task; 1× guaranteed / 3× ceiling resources, five attempts per task.

Source ↗Observed 2026-10-14

ARC-AGI-2 not reported

GPQA Diamond not reported

AIME 2025 not reported

LMArena / Text Arena

pretty okay

1498 Elo

Text Arena overall, no adjustments. Leaderboard dated October 13, 2026. ±3.

Source ↗Observed 2026-10-14

MRCRv2 · 128k–256k not reported

The top score means the top sourced score in this snapshot. Different harnesses, budgets and samples can change results. A blank cell is a blank cell.

Verdict history

Each import keeps previous observations. Verdicts can also change when the comparison score changes.

SWE-bench Verifiedpretty great · 80.82026-10-15 14:06:27Source ↗

Terminal-Bench 2.0pretty great · 65.42026-10-15 14:06:27Source ↗

ARC-AGI-2not reported · not reported2026-10-15 14:06:27

GPQA Diamondnot reported · not reported2026-10-15 14:06:27

AIME 2025not reported · not reported2026-10-15 14:06:27

LMArena / Text Arenapretty okay · 14982026-10-15 14:06:27Source ↗

MRCRv2 · 128k–256knot reported · not reported2026-10-15 14:06:27