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-6.1 Sollow+27%—$0.13Remove unsupported parameters+5
OpenDeepSeek V4 Pro 0813max+6%—$0.67No image input+5BetterGPT-6 Sollow+11%—$0.13
BetterMiniMax M3.1 Flashthinking+22%—$0.22Complete model response must be appendedBetterGPT-5.6 Sollow+24%—$0.26ModelScoreCostPer taskWhat changes
Nothing here yet.
ModelScoreCostPer taskWhat changes
GPT-6.1 Sollow+27%—$0.13Remove unsupported parameters+5GPT-6 Sollow+11%—$0.13MiniMax M3.1 Flashthinking+22%—$0.22Complete model response must be appendedGPT-5.6 Sollow+24%—$0.26
Claude Opus 5.5low+37%—$0.55No forced tool use+5ModelScoreCostPer taskWhat changes
DeepSeek V4 Pro 0813maxOpen+6%—$0.67No image input+5
Kimi K3maxOpen+3%—$2.00Sampling parameters are fixed+3DeepSeek V4.1 Flash 1017maxOpen-7%—$0.26Pass back reasoning_content · Chat Completions+4TInklingxhighOpen-10%—$0.95 / $4.05Context: 400K → 256K
Step 5 PreviewthinkingOpen-10%—$1.03web_search not available · Chat Completions+2ModelScoreCostPer taskWhat changes
GPT-6 Astramedium+31%—$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmedium+31%—$0.21Remove unsupported parameters+5GPT-5.6 Solmedium+25%—$0.50GPT-5.5medium+23%—$0.90Prompts with >272K input tokensGPT-6 Solmedium+16%—$0.25GPT-5.3 Codexxhigh+14%—$1.75 / $14DeprecatedGPT-5.6 Terramedium-4%—$0.18Prompts with >272K input tokensGPT-5.5 Instant (June 2026)-4%—$0.69All 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 Claude Opus 4.5?›
On AA Omniscience · Accuracy, GPT-5.5 Instant (May 2026) scores 46.3 vs 46.6 — 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 DeepSeek V4 Pro 0813.
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-6.1 Sol (better), DeepSeek V4 Pro 0813 (open weights).