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 Lunamedium+10%—$0.016
OpenMiMo v2.6 Prothinking×2—$0.13Pass back reasoning_content+3BetterGPT-6 Lunamedium+32%—$0.017Function calling only with none · Chat Completions+3
BetterClaude Haiku 5.5low+30%—$0.024Remove sampling parameters+5BetterMiMo v2.5 ProthinkingOpen+15%—$0.054No image inputModelScoreCostPer taskWhat changes
Nothing here yet.
ModelScoreCostPer taskWhat changes
GPT-5.6 Lunamedium+10%—$0.016GPT-6 Lunamedium+32%—$0.017Function calling only with none · Chat Completions+3Claude Haiku 5.5low+30%—$0.024Remove sampling parameters+5MiMo v2.5 ProthinkingOpen+15%—$0.054No image inputMiMo v2.6 FlashthinkingOpen+67%—$0.062Pass back reasoning_content+3ModelScoreCostPer taskWhat changes
MiMo v2.6 ProthinkingOpen×2—$0.13Pass back reasoning_content+3
DeepSeek V4.1 Flash 1017maxOpen+99%—$0.26Pass back reasoning_content · Chat Completions+4
GLM 5.3maxOpen+97%—$2.01No image input+4
Step 5 PreviewthinkingOpen+93%—$1.03web_search not available · Chat Completions+2
Kimi K3maxOpen+92%—$2.00Sampling parameters are fixed+3ModelScoreCostPer taskWhat changes
GPT-6 Astramedium×2.2—$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmedium×2.1—$0.21Remove unsupported parameters+5GPT-6 Solmedium+75%—$0.25GPT-5.6 Solmedium+73%—$0.50GPT-5.5medium+49%—$0.90Prompts with >272K input tokensGPT-5.3 Codexxhigh+43%—$1.75 / $14DeprecatedGPT-5.6 Terramedium+33%—$0.18Prompts with >272K input tokensGPT-6 Lunamedium+32%—$0.017Function calling only with none · Chat Completions+3All OpenAI models →History
2 versionsBenchmarks
all categoriesChat & Knowledge
Humanity's Last Exam21.6#116
AA Omniscience Index11.2#38
CritPt (physics)2.6#97
AA Intelligence Index 4.3.2≈22.7#100
AA Omniscience · Accuracy46.3#33
AA-LCR (long context) 1.166.3#136
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?›
#116 of 334 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 Hy3 preview?›
On AA Intelligence Index 4.3.2, GPT-5.5 Instant (May 2026) scores 22.7 vs 22.7 — 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 MiMo v2.6 Pro.
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), MiMo v2.6 Pro (open weights).