GPT-5.6 Sol

OpenAI · Closed weights · Released Jul 9, 2026 · $4 in · $20 out per 1M tokens

69Overall · rank 5

Score by job

75 · rank 8 · 3 of 5 benchmarks

Benchmark	Result	Variant	z
DeepSWE	72.7%	gpt-5.6-sol_max	0.99
FrontierCode	47.5%	gpt-5.6-sol_unknown	0.82
LMArena Coding	1490 rating	gpt-5.6-sol-xhigh	-0.04

64 · rank 5 · 2 of 4 benchmarks

Benchmark	Result	Variant	z
APEX-Agents	51.4%	gpt-5.6-sol_promax	-0.09
OSWorld 2.0	27.3%	gpt-5.6-sol_max	1.07

76 · rank 9 · 3 of 4 benchmarks

Benchmark	Result	Variant	z
GPQA Diamond	93.5%	gpt-5.6-sol_max	0.78
ARC-AGI-2	92.5%	gpt-5.6-sol_max	1.31
SimpleBench	71.7%	gpt-5.6-sol_proxhigh	0.63

76 · rank 6 · 5 of 5 benchmarks

Benchmark	Result	Variant	z
FrontierMath Tiers 1–3	89.1%	gpt-5.6-sol_max	1.46
FrontierMath Tier 4	82.9%	gpt-5.6-sol_max	1.75
OTIS Mock AIME	100.0%	gpt-5.6-sol_max	1.09
ProofBench	83.0%	gpt-5.6-sol_max	1.39
LMArena Math	1466 rating	gpt-5.6-sol-xhigh	-0.54

67 · rank 16 · 2 of 2 benchmarks

Benchmark	Result	Variant	z
LMArena Creative Writing	1452 rating	gpt-5.6-sol-xhigh	0.04
LMArena Instruction Following	1477 rating	gpt-5.6-sol-xhigh	0.48

55 · rank 13 · 1 of 1 benchmarks

Benchmark	Result	Variant	z
LMArena WebDev	1617 rating	gpt-5.6-sol-xhigh (codex-harness)	0.59