GPT-5.5 Instant (May 2026)
May 2026
GPT-5.5 Instant (May 2026)Compare inon
Benchmarks of GPT-5.5 Instant (May 2026)11
BenchmarkByScoreRank
Overall1
Knowledge4
Science2
Coding1
Documents1
Legacy · saturated or no longer reported2
No benchmark matches
—per task?
API price not publicprice
—output speed?
400Kcontext
Ranking?
Alternatives?
ModelScoreCostPer taskWhat changes
BetterGPT-5.6 Lunahigh+5%—$0.044
OpenKimi K3max+11%—$2.00Sampling parameters are fixed+3
BetterHy3thinkingOpen+6%—$0.072Context: 400K → 256K+1TBetterInkling SmallthinkingOpen+6%—$0.089Context: 400K → 256K
BetterMiniMax M2.7thinkingOpen+3%—$0.11Context: 400K → 205K+1ModelScoreCostPer taskWhat changes
Nothing here yet.
ModelScoreCostPer taskWhat changes
GPT-5.6 Lunahigh+5%—$0.044Hy3thinkingOpen+6%—$0.072Context: 400K → 256K+1TInkling SmallthinkingOpen+6%—$0.089Context: 400K → 256KMiniMax M2.7thinkingOpen+3%—$0.11Context: 400K → 205K+1GPT-5.6 Terramedium+3%—$0.18Prompts with >272K input tokensModelScoreCostPer taskWhat changes
Kimi K3maxOpen+11%—$2.00Sampling parameters are fixed+3
Qwen3.8 2.4T A95BthinkingOpen+11%—$2.16Context: 400K → 262K+6MiniMax M3thinkingOpen+10%—$0.51Deployment status experimental · Self-hosted
DeepSeek V4 Pro 0813maxOpen+10%—$0.67No image input+5Qwen3.8 FlashthinkingOpen+9%—$0.37Context: 400K → 262K+6ModelScoreCostPer taskWhat changes
GPT-6 Astramedium+11%—$1.54Monitoring can return HTTP 403+2GPT-5.6 Solmedium+9%—$0.50GPT-5.5medium+9%—$0.77Prompts with >272K input tokensGPT-5.3 Codexxhigh+8%—$1.75 / $14DeprecatedGPT-5.6 Terramedium+3%—$0.18Prompts with >272K input tokensGPT-5.2medium+2%—$1.75 / $14GPT-5.6 Lunamedium+1%—$0.016o3 Prothinkingsame—$20 / $80Context: 400K → 200KAll OpenAI models →History
2 versionsBenchmarks
all categoriesChat & Knowledge
Humanity's Last Exam21.6#118
AA Omniscience Index11.2#39
CritPt (physics)2.6#99
AA Intelligence Index 4.3.2≈22.7#102
AA Omniscience · Accuracy46.3#34
AA-LCR (long context) 1.166.3#138
GPQA Diamond84.6#84
Coding
Agents & Tool Use
τ²-bench · AA49.4#111
Writing & Language
IFBench (instructions)71.5#41
FAQ
How much does GPT-5.5 Instant (May 2026) cost?›
There is no per-unit API price: API price not public.
Is GPT-5.5 Instant (May 2026) free to use?›
There is no free API.
How good is GPT-5.5 Instant (May 2026), and what is it best at?›
#118 of 336 in Chat & Knowledge, #28 of 239 in Coding, #109 of 242 in Agents & Tool Use, #41 of 245 in Writing & Language. Strongest at: Knowledge, Instructions.
Is GPT-5.5 Instant (May 2026) better than GLM 5 Turbo?›
On GPQA Diamond, GPT-5.5 Instant (May 2026) scores 84.6 vs 84.7 — about the same.
What is the context window of GPT-5.5 Instant (May 2026)?›
400K tokens.
When was GPT-5.5 Instant (May 2026) released? Is there a newer version?›
Released 2026-05-05. It has been superseded by GPT-5.5 Instant (June 2026).
Is GPT-5.5 Instant (May 2026) open source?›
No, GPT-5.5 Instant (May 2026) is a closed model available through an API. The closest open-weights option here is Kimi K3.
Can GPT-5.5 Instant (May 2026) read images?›
It accepts text and images as input.
What is GPT-5.5 Instant (May 2026)?›
GPT-5.5 Instant (May 2026) is a closed language model from OpenAI, released May 2026.
What are the best alternatives to GPT-5.5 Instant (May 2026)?›
GPT-5.6 Luna (better), Kimi K3 (open weights).