GPT-5.5 Instant (June 2026)
Jun 2026
GPT-5.5 Instant (June 2026)Compare inon
GPT-5.5 Instant (June 2026) measured on 10 of 109 Chat & Knowledge benchmarks10
BenchmarkByScoreRank
Overall1
Knowledge3
Science2
Health & law1
Documents2
Legacy · saturated or no longer reported1
No benchmark matches
$0.57per task?
API price not publicprice
158 tok/sfirst token in 0.9 s?
400Kcontext
Alternatives?
ModelScoreCostPer taskWhat changes
CheaperGPT-6.1 Solhigh×11.2-44%$0.32Remove unsupported parameters+5BetterGPT-6.1 Terralow×6.4-90%$0.055
OpenMuse Spark Openxhigh×6.7+48%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1CheaperGPT-6 Solmedium×7.3-57%$0.25
CheaperGrok 4.6low×7-34%$0.38ModelScoreCostPer taskWhat changes
GPT-6.1 Solhigh×11.2-44%$0.32Remove unsupported parameters+5GPT-6.1 Terramax×8-29%$0.40GPT-6 Solmedium×7.3-57%$0.25Grok 4.6low×7-34%$0.38
Claude Sonnet 5.5medium×5.4-15%$0.48No forced tool use+5ModelScoreCostPer taskWhat changes
GPT-6.1 Terralow×6.4-90%$0.055Claude Haiku 5.5high+55%-86%$0.079Remove sampling parameters+5GPT-6.1 Sollow×10.2-77%$0.13Remove unsupported parameters+5GPT-6 Sollow×7.2-77%$0.13
MiMo v2.6 ProthinkingOpen×2.3-77%$0.13Pass back reasoning_content+3ModelScoreCostPer taskWhat changes
Muse Spark OpenxhighOpen×6.7+48%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1
Kimi K3maxOpen×5.3+252%$2.00Sampling parameters are fixed+3
Step 5 PreviewthinkingOpen×4.4+80%$1.03web_search not available · Chat Completions+2
GLM 5.3maxOpen×3.9+253%$2.01No image input+4MMotif 3Open×2.8—$0.50 / $2Context: 400K → 262K+1ModelScoreCostPer taskWhat changes
GPT-6 Astramedium×11.4+171%$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmedium×10.8-62%$0.21Remove unsupported parameters+5GPT-6.1 Terramedium×7.3-83%$0.095GPT-6 Solmedium×7.3-57%$0.25GPT-5.6 Solmedium×5.2-11%$0.50GPT-5.5medium×4.9+35%$0.77Prompts with >272K input tokensGPT-5.5 Instant (May 2026)×3——GPT-5.3 Codexxhigh×2.9—$1.75 / $14DeprecatedAll OpenAI models →History
2 versionsBenchmarks
in Chat & KnowledgeAA Omniscience Index3.7#58
AA Omniscience · Accuracy44.4#36
Humanity's Last Exam19.9#127
GPQA Diamond82.3#103
CritPt (physics)0#182
GDP.pdf · AA all-pass20.2#26
MLCR-AA31.7#6
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?›
#127 of 336 in Chat & Knowledge, #36 of 134 in Coding, #48 of 135 in Agents & Tool Use, #26 of 135 in Vision & Documents. Strongest at: Knowledge.
Is GPT-5.5 Instant (June 2026) better than GPT-5.5 Instant (May 2026)?›
On AA Omniscience Index, GPT-5.5 Instant (June 2026) scores 3.7 vs 11.2 — 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 Muse Spark Open.
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-6.1 Terra (better), Muse Spark Open (open weights).