GPT-5.6 Terra

Composite indexes

• Artificial Analysis Intelligence Index#16 of 142
  42independentAA Intelligence Index v4.3.2, max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Opus 5.5 at 58

Coding

• Terminal-Bench 4.0#11 of 88
  35.4%independentTerminal-Bench 4.0 (AA harness), max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Mythos 5.1 at 60.9%

• Terminal-Bench 2.x#9 of 103
  88%independentTerminal-Bench 2.1 (AA harness), max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Fable 5.1 at 91.4%

• SciCode#21 of 94
  55%independentmax effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Opus 5.5 at 66.9%

Agents and tool use

• GDPval-AA#26 of 103
  1432independentGDPval-AA, max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Opus 5.5 at 1846

• τ²-Bench#24 of 88
  86.3%independenttelecom (AA), max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: GLM-5.2 at 99.1%

Reasoning and knowledge

• Humanity’s Last Exam#23 of 147
  42.9%independentno tools (AA), max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Opus 5.5 at 61.4%

• GPQA Diamond#21 of 142
  92.5%independentAA, max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: GPT-6 Astra at 96.1%

• CritPt#5 of 139
  30%independentmax effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: GPT-5.6 Sol at 32.3%

• ARC-AGI-2#9 of 25
  83.9%independentsemi-private, MaxARC Prize leaderboard ↗

  Leader: GPT-6 Astra at 95%

• ARC-AGI-3#7 of 9
  0.8%independentsemi-private, MaxARC Prize leaderboard ↗

  Leader: GPT-6 Astra at 62.7%

Vision and long context

• AA Long Context Reasoning#13 of 139
  83%independentmax effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Kimi K3 at 88.7%

• MMMU-Pro#13 of 72
  80.7%independentAA, max effortArtificial Analysis: GPT-5.6 Terra (max) ↗

  Leader: Claude Opus 5.5 at 87.7%

Human preference

• LMArena Text#23 of 54
  1466independentgpt-5.6-terra-xhigh, style control default, vote cutoff 2026-09-13LMArena Text leaderboard ↗

  Leader: Claude Fable 5 at 1506

• LMArena WebDev#32 of 54
  1519independentgpt-5.6-terra-xhigh, LMArena Code arena (formerly WebDev), vote cutoff 2026-09-23LMArena Code (WebDev) leaderboard ↗

  Leader: Claude Opus 5.5 at 1818

Other published results