GPT-5.6 Terra

OpenAI · Closed weights · Released Jul 9, 2026 · $2 in · $12 out per 1M tokens

52Overall · rank 16

Score by job

65 · rank 14 · 3 of 5 benchmarks

Benchmark	Result	Variant	z
DeepSWE	69.6%	gpt-5.6-terra_max	0.80
FrontierCode	41.3%	gpt-5.6-terra_unknown	0.18
LMArena Coding	1485 rating	gpt-5.6-terra-xhigh	-0.26

Not enough data · 1 of 4 benchmarks

Benchmark	Result	Variant	z
APEX-Agents	58.2%	gpt-5.6-terra_max	0.56

49 · rank 19 · 3 of 4 benchmarks

Benchmark	Result	Variant	z
GPQA Diamond	93.3%	gpt-5.6-terra_max	0.70
ARC-AGI-2	83.9%	gpt-5.6-terra_max	0.92
SimpleBench	48.9%	gpt-5.6-terra_unknown	-1.65

68 · rank 8 · 5 of 5 benchmarks

Benchmark	Result	Variant	z
FrontierMath Tiers 1–3	86.0%	gpt-5.6-terra_max	1.24
FrontierMath Tier 4	70.7%	gpt-5.6-terra_max	1.24
OTIS Mock AIME	99.7%	gpt-5.6-terra_max	1.02
ProofBench	74.0%	gpt-5.6-terra_xhigh	1.04
LMArena Math	1460 rating	gpt-5.6-terra-xhigh	-0.77

46 · rank 36 · 2 of 2 benchmarks

Benchmark	Result	Variant	z
LMArena Creative Writing	1409 rating	gpt-5.6-terra-xhigh	-1.26
LMArena Instruction Following	1453 rating	gpt-5.6-terra-xhigh	-0.43

33 · rank 28 · 1 of 1 benchmarks

Benchmark	Result	Variant	z
LMArena WebDev	1519 rating	gpt-5.6-terra-xhigh (codex-harness)	-0.39