GPT-5.5 Instant (June 2026)
Jun 2026
GPT-5.5 Instant (June 2026)Compare inon
GPT-5.5 Instant (June 2026) measured on 9 of 104 Chat & Knowledge benchmarks9
BenchmarkByScoreRank
Overall1
Knowledge3
Science2
Documents2
Legacy · saturated or no longer reported1
No benchmark matches
$0.69per task?
API price not publicprice
167 tok/sfirst token in 0.9 s?
400Kcontext
Alternatives?
ModelScoreCostPer taskWhat changes
CheaperGPT-6.1 Solxhigh×2.6-43%$0.39Remove unsupported parameters+5BetterGPT-5.6 Lunamedium+29%-98%$0.016
OpenMiMo v2.6 Prothinking×2.5-81%$0.13Pass back reasoning_content+3
CheaperClaude Opus 5.5low×2.4-20%$0.55No forced tool use+5
CheaperMiniMax M3.1 Flashthinking×2.4-68%$0.22Complete model response must be appendedModelScoreCostPer taskWhat changes
GPT-6.1 Solxhigh×2.6-43%$0.39Remove unsupported parameters+5MiMo v2.6 ProthinkingOpen×2.5-81%$0.13Pass back reasoning_content+3Claude Opus 5.5low×2.4-20%$0.55No forced tool use+5MiniMax M3.1 Flashthinking×2.4-68%$0.22Complete model response must be appendedGPT-6 Solxhigh×2.3-25%$0.52ModelScoreCostPer taskWhat changes
GPT-5.6 Lunamedium+29%-98%$0.016GPT-6 Lunamedium+42%-97%$0.017Function calling only with none · Chat Completions+3MiMo v2.5thinkingOpen+37%-97%$0.019Claude Haiku 5.5low+36%-96%$0.024Remove sampling parameters+5MiMo v2.5 ProthinkingOpen+79%-92%$0.054No image inputModelScoreCostPer taskWhat changes
MiMo v2.6 ProthinkingOpen×2.5-81%$0.13Pass back reasoning_content+3
Kimi K3maxOpen×2.4+189%$2.00Sampling parameters are fixed+3
Step 5 PreviewthinkingOpen×2.3+48%$1.03web_search not available · Chat Completions+2
Muse Spark OpenxhighOpen×2.2+22%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1
DeepSeek V4.1 Flash 1017maxOpen×2.2-62%$0.26Pass back reasoning_content · Chat Completions+4ModelScoreCostPer taskWhat changes
GPT-6 Astramedium×2.6+123%$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmedium×2.5-69%$0.21Remove unsupported parameters+5GPT-5.3 Codexxhigh×2.1—$1.75 / $14DeprecatedGPT-5.5medium×2.1+30%$0.90Prompts with >272K input tokensGPT-5.6 Solmedium×2.1-27%$0.50GPT-6 Solmedium×2.1-64%$0.25GPT-5.6 Terramedium+67%-73%$0.18Prompts with >272K input tokensGPT-6 Lunamedium+42%-97%$0.017Function calling only with none · Chat Completions+3All OpenAI models →History
2 versionsBenchmarks
in Chat & KnowledgeAA Omniscience Index3.7#57
AA Omniscience · Accuracy44.4#35
Humanity's Last Exam19.9#125
GPQA Diamond82.3#103
CritPt (physics)0#180
GDP.pdf · AA all-pass20.2#25
FAQ
How much does GPT-5.5 Instant (June 2026) cost?›
There is no per-unit API price: API price not public.
Is GPT-5.5 Instant (June 2026) free to use?›
There is no free API.
How good is GPT-5.5 Instant (June 2026), and what is it best at?›
#125 of 334 in Chat & Knowledge, #34 of 132 in Coding, #46 of 133 in Agents & Tool Use, #25 of 133 in Vision & Documents. Strongest at: Knowledge.
Is GPT-5.5 Instant (June 2026) better than GPT-5.5 Instant (May 2026)?›
On Humanity's Last Exam, GPT-5.5 Instant (June 2026) scores 19.9 vs 21.6 — lower.
What is the context window of GPT-5.5 Instant (June 2026)?›
400K tokens.
When was GPT-5.5 Instant (June 2026) released? Is there a newer version?›
Released 2026-06-25. It is the current version in its line.
Is GPT-5.5 Instant (June 2026) open source?›
No, GPT-5.5 Instant (June 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 (June 2026) read images?›
It accepts text and images as input.
What is GPT-5.5 Instant (June 2026)?›
GPT-5.5 Instant (June 2026) is a closed language model from OpenAI, released Jun 2026, the successor to GPT-5.5 Instant (May 2026).
What are the best alternatives to GPT-5.5 Instant (June 2026)?›
GPT-6.1 Sol (cheaper), GPT-5.6 Luna (better), MiMo v2.6 Pro (open weights).