GPT-5.5 Instant

OpenAI
GPT-5.5 Instant launch post cover
Context
400Ktokens
Released
6mo ago

Benchmarks

DeepSWE is the primary coding benchmark where an exact model evaluation exists. Arena leaderboards and other sourced evaluations appear below; missing scores are not zero.

How it ranks

Against its predecessor, similarly priced models and the models ranked around it.

DeepSWE 1.1

Best pass@1 per model · Higher is better

Not evaluated in DeepSWE 1.1

Arena Text

Best Arena rating per model · Higher is better

Arena #44

  1. 1474
    GPT-6 AstraNearby rank
  2. 1474
    Claude Opus 4.5Nearby rank
  3. 1473
    GPT-5.5 Instant
  4. 1472
  5. 1472
  6. 1467
    ERNIE 5.1Similar release date
  7. 1467
    MiMo-V2.5-ProSimilar release date
  8. 1458
    DeepSeek V4 Pro 0423Similar release date
  9. 1427
    Mistral Medium 3.5Similar release date

Ahead of 2 of 4 models released around the same time

Arena WebDev

Best Arena rating per model · Higher is better

Not ranked on Arena WebDev yet

Arena Vision

Best Arena rating per model · Higher is better

Arena #33

  1. 1281
    Gemini 3.5 FlashSimilar release date
  2. 1279
    Muse Spark 1.1Nearby rank
  3. 1278
    GPT-5.2 ChatNearby rank
  4. 1277
    GPT-5.5 Instant
  5. 1275
  6. 1272
    GLM 5.3 FlashNearby rank
  7. 1265
    Kimi K2.6Similar release date
  8. 1234
    MiMo-V2.5Similar release date
  9. 1199
    Mistral Medium 3.5Similar release date

Ahead of 2 of 4 models released around the same time

Arena Search

Best Arena rating per model · Higher is better

Not ranked on Arena Search yet

Arena Document

Best Arena rating per model · Higher is better

Arena #26

  1. 1494
    Claude Opus 4.7Similar release date
  2. 1480
    Muse Spark 1.1Similar release date
  3. 1466
    Grok 4.5Nearby rank
  4. 1460
    GPT-5.6 LunaNearby rank
  5. 1460
    GPT-5.5 Instant
  6. 1459
  7. 1459
    Gemini 3.5 FlashSimilar release date
  8. 1450
    Kimi K2.6Similar release date

Ahead of 0 of 4 models released around the same time

Agent Arena

Best IPS score per model · Higher is better

Not ranked on Agent Arena yet

FrontierMath-Tier-4-v2-Private

Best score per model · Higher is better

#64 of 72

  1. 34.1%
    Qwen3.7 MaxSimilar release date
  2. 26.8%
    Gemini 3.5 FlashSimilar release date
  3. 25.6%
    Kimi K2.6Similar release date
  4. 2.4%
    DeepSeek V4 Pro 0423Similar release date
  5. 2.4%
    GPT-5 NanoNearby rank
  6. 2.4%
    GPT-5.5 Instant
  7. 0.0%
    Gemini 2.5 ProNearby rank
  8. 0.0%

Ahead of 0 of 4 models released around the same time

FrontierMath-Tiers-1-3-v2-Private

Best score per model · Higher is better

#71 of 87

  1. 57.2%
    Kimi K2.6Similar release date
  2. 45.3%
    DeepSeek V4 Pro 0423Similar release date
  3. 31.2%
  4. 27.7%
    Gemini 3.1 Flash LiteSimilar release date
  5. 26.3%
    GPT-5.5 Instant
  6. 26.0%
  7. 24.6%
    Gemini 2.5 ProNearby rank
  8. 22.5%
    Qwen3.6 FlashSimilar release date

Ahead of 1 of 4 models released around the same time

GPQA diamond

Best score per model · Higher is better

#80 of 161

  1. 90.9%
    DeepSeek V4 Pro 0423Similar release date
  2. 90.8%
    Kimi K2.6Similar release date
  3. 83.3%
    Qwen3.6 FlashSimilar release date
  4. 83.3%
    GLM 4.7Nearby rank
  5. 82.5%
    GPT-5.5 Instant
  6. 82.3%
  7. 82.3%
    Qwen3.5-FlashNearby rank
  8. 81.8%
    Gemini 3.1 Flash LiteSimilar release date

Ahead of 1 of 4 models released around the same time

OTIS Mock AIME 2024-2025

Best score per model · Higher is better

#101 of 158

  1. 96.7%
    DeepSeek V4 Pro 0423Similar release date
  2. 96.1%
    Kimi K2.6Similar release date
  3. 84.4%
    Qwen3.6 FlashSimilar release date
  4. 80.0%
    Gemini 3.1 Flash LiteSimilar release date
  5. 69.4%
    Seed 1.6Nearby rank
  6. 68.9%
    Claude Opus 4.1Nearby rank
  7. 68.1%
    GPT-5.5 Instant
  8. 67.5%
  9. 66.9%
    Qwen3 32BNearby rank

Ahead of 0 of 4 models released around the same time

Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.

All published scores

Benchmark compilation: Epoch AI, Capabilities & benchmarking (CC BY attribution). Scores are converted to percentages and model names matched to the Vertical Tabs catalog. Individual evaluations are credited to their original sources. External results may carry separate licences and evaluation configurations; do not interpret scores from different harnesses as directly comparable.

Arena ratings: Arena (lmarena-ai/leaderboard-dataset), licensed CC BY 4.0. Ratings come from pairwise human votes and are only comparable within one leaderboard; the interval is Arena's 95% confidence interval. Model names are matched to the Vertical Tabs catalog.

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