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OpenAI · released 2026-06-25

GPT-5.5 Instant

Measured on 58 benchmarks.

21.6

#49 of 98 models

includes estimates: 45% of the mix is measured for this model

Strengths

  • GPT-5.5 Instant
  • Gemini 4 Carbon (#1)
  • Field median
bestField medianFrontierCode 2.0-…Terminal-Bench v4…AA-Briefcase v1.1AutomationBench-AATerminal-Bench-Sc…HLE-DiamondCritPt v2 Hard Su…AA-Omniscience v1…AA-Omniscience v1…GDP.pdf
  1. FrontierCode 2.0-AA15%16.9% est.#43 of 98
  2. Terminal-Bench v4-AA10%12.6%#42 of 98
  3. AA-Briefcase v1.115%1087#58 of 98
  4. AutomationBench-AA5%36.4%#56 of 98
  5. Terminal-Bench-Science-AA15%7.1% est.#31 of 98
  6. HLE-Diamond10%14.6%#55 of 98
  7. CritPt v2 Hard Subset10%29.2% est.#42 of 98
  8. AA-Omniscience v1.1 Accuracy10%39.4% est.#32 of 98
  9. AA-Omniscience v1.1 Non-hallucination5%23.2% est.#87 of 98
  10. GDP.pdf5%20.2%#30 of 98

Bars show where GPT-5.5 Instant sits among the 98 ranked models on each benchmark (right is best); the tick is the field median.

Cost and speed

against 98 ranked models

Output speed

#23 fastest of 79

134 tok/s

Time to first token

#9 quickest of 79

1.3s

Token price

$0.760 per 1M tokens at API prices

97.0% cache read · 2.50% fresh input · 0.00% cache write · 0.50% output

Assumed mix: no measured T3 Code usage for this model.

Not measured for GPT-5.5 Instant: cost per task, time per task, output tokens per task (no published API price yet).

This ranking’s benchmarks

5 of 10 measured

agentic

AutomationBench-AA

245 results
  1. #123default of 24536.4%

Leader: Gemini 4 Carbon · 77.8%

agentic

AA-Briefcase v1.1

250 results
  1. #128default of 2501087

Leader: Sonnet 5.5 · 1813

economics

GDP.pdf

243 results
  1. #77default of 24320.2%

Leader: Muse Wonder Full · 32.6%

reasoning

HLE-Diamond

153 results
  1. #89default of 15314.6%

Leader: Gemini 4 Carbon · 69.1%

coding

Terminal-Bench v4-AA

241 results
  1. #99default of 24112.6%

Leader: Kimi K3.1 · 67.2%

All 58 benchmarks

show 53 more