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Benchmarks › OpenAI › GPT
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GPT-5.5

First OpenAI model past 80% on Terminal-Bench 2.0; 2x price above 272K input.

Released
Apr 23, 2026
Price in / out
$5 / $30
Blended $/1M
$11
Context
1M

Benchmark scoresvs GPT-5.4

BenchmarkScoreRank (current)Source
Terminal-Bench 2.1
76.4%#8 of 21benchlm.ai ↗
GPQA Diamond
93.6%#3 of 11benchlm.ai ↗
Humanity's Last Exam
41.4%#10 of 15vellum.ai ↗
ARC-AGI-2
85%#6 of 10benchlm.ai ↗
τ²-bench (Telecom)
98%#1 of 10benchlm.ai ↗
Artificial Analysis Intelligence Index
54.8#2 of 11benchlm.ai ↗
LMArena Text
1481#1 of 5toolcenter.ai ↗

GPT versions

Timeline
Version$ in / outTerminal-BenchSWE-benchGPQAHLEARC-AGI-2τ²-bench
GPT-4oRetired$2.5 / $10—————25.1%
o1Retired$15 / $60—————62.6%
o3-miniRetired$1.1 / $4.4—49.3%———28.7%
GPT-4.1Superseded$2 / $8—54.6%———47.1%
o3Superseded$2 / $8—69.1%———80.7%
GPT-5Superseded$1.25 / $10—74.9%85.7%——84.8%
GPT-5.1Superseded$1.25 / $10—————81.9%
GPT-5.2Superseded$1.75 / $14—80%——52.9%84.8%
GPT-5.3 CodexSuperseded$1.75 / $14—85%———86%
GPT-5.4Superseded$2.5 / $15——92.8%39.8%73.3%98.9%
GPT-5.5Superseded$5 / $3076.4%—93.6%41.4%85%98%
GPT-5.5 ProSuperseded$30 / $180———43.1%84.2%—
GPT-5.6 LunaSuperseded$0.2 / $1.279%—92.3%—59.5%—
GPT-5.6 SolSuperseded$5 / $3085.8%—94.6%—92.5%85.1%
GPT-5.6 TerraSuperseded$2 / $1277.5%—92.9%—83.9%86.3%
GPT-6 Astra$10 / $5087.3%—96%57.2%95%—
GPT-6 Luna$0.1 / $0.573%———59.3%—
GPT-6 SolSuperseded$2 / $1083.1%———89.6%—
GPT-6.1 Sol$2 / $10————94.2%—