GPT-5.6 Terra

OpenAI
GPT-5.6 Terra launch post cover

Cost/1M tokens

input
$2.00
cached
$0.20
output
$12.00
cache write
$2.50
Context
1.1Mtokens
Released
4mo 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

#6 of 28

Arena Text

Best Arena rating per model · Higher is better

Arena #51

  1. 1487
    Kimi K3Similar price
  2. 1487
  3. 1481
    GPT-5.5Predecessor
  4. 1472
    Claude Sonnet 5.5Similar price
  5. 1472
  6. 1468
    GPT-5.6 Terra
  7. 1467
    ERNIE 5.1Nearby rank
  8. 1467
    MiMo-V2.5-ProNearby rank
  9. 1354
    Command ASimilar price

-13 vs GPT-5.5 (predecessor) · Ahead of 1 of 4 similarly priced models

Arena WebDev

Best Arena rating per model · Higher is better

Arena #61

  1. 1773
    Claude Sonnet 5.5Similar price
  2. 1676
    Qwen3.8 Max (0902)Similar price
  3. 1658
    Kimi K3Similar price
  4. 1526
    Muse Spark OpenNearby rank
  5. 1522
  6. 1520
    GPT-5.6 Terra
  7. 1519
    GPT-5.6 LunaNearby rank
  8. 1515
    Qwen3.7 MaxNearby rank
  9. 1512
    GPT-5.5Predecessor
  10. 1446

Level with GPT-5.5 (predecessor, overlapping 95% CIs) · Ahead of 1 of 4 similarly priced models

Arena Vision

Best Arena rating per model · Higher is better

Arena #37

  1. 1285
    GPT-5.5Predecessor
  2. 1280
    Grok 4.5Similar price
  3. 1280
  4. 1275
  5. 1272
    GLM 5.3 FlashNearby rank
  6. 1266
    GPT-5.6 Terra
  7. 1266
  8. 1265
    Gemma 4 31BNearby rank
  9. 1263
    Claude Sonnet 5.5Similar price
  10. 1199
    Mistral Medium 3.5Similar price

-18 vs GPT-5.5 (predecessor) · Ahead of 1 of 4 similarly priced models

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 #15

  1. 1481
    GPT-5.5Predecessor
  2. 1480
    Muse Spark 1.1Nearby rank
  3. 1478
  4. 1474
    GPT-5.6 Terra
  5. 1474
    Muse Spark 1.3Nearby rank
  6. 1474
    GPT-6 AstraNearby rank
  7. 1469
    Claude Sonnet 5Similar price
  8. 1466
    Grok 4.5Similar price
  9. 1459
  10. 1433
    Gemini 2.5 ProSimilar price

Level with GPT-5.5 (predecessor, overlapping 95% CIs) · Ahead of 2 of 4 similarly priced models

Agent Arena

Best IPS score per model · Higher is better

Arena #35

  1. +0.160
    Claude Sonnet 5.5Similar price
  2. +0.026
    Grok 4.7Similar price
  3. +0.006
    Kimi K3Similar price
  4. -0.000
    MiMo-V2.6-FlashNearby rank
  5. -0.002
    Grok 4.6Nearby rank
  6. -0.018
    GPT-5.6 Terra
  7. -0.022
    Gemini 3.7 FlashNearby rank
  8. -0.027
  9. -0.045

Ahead of 1 of 4 similarly priced models

ARC-AGI-2

Best score per model · Higher is better

#16 of 85

  1. 85.0%
    GPT-5.5Predecessor
  2. 84.6%
    Gemini 3.7 FlashNearby rank
  3. 84.6%
    GPT-5.5 ProNearby rank
  4. 83.9%
    GPT-5.6 Terra
  5. 83.9%
    Claude Sonnet 5.5Similar price
  6. 83.3%
    GPT-5.4 ProNearby rank
  7. 77.1%
  8. 67.1%
    Grok 4.6Similar price
  9. 60.4%
    Kimi K3Similar price

-1.1 pts vs GPT-5.5 (predecessor) · Ahead of 3 of 4 similarly priced models

FrontierMath-Tier-4-v2-Private

Best score per model · Higher is better

#17 of 72

  1. 80.5%
    Claude Sonnet 5.5Similar price
  2. 73.2%
    Claude Opus 5Nearby rank
  3. 72.5%
    GPT-5.5Predecessor
  4. 70.7%
    GPT-5.6 Terra
  5. 61.0%
    GPT-5.6 LunaNearby rank
  6. 58.5%
    GPT-5.4 ProNearby rank
  7. 39.0%
    Kimi K3Similar price
  8. 34.1%
    Qwen3.8 Max (0902)Similar price
  9. 26.8%

-1.8 pts vs GPT-5.5 (predecessor) · Ahead of 3 of 4 similarly priced models

FrontierMath-Tiers-1-3-v2-Private

Best score per model · Higher is better

#13 of 87

  1. 88.8%
    Claude Sonnet 5.5Similar price
  2. 87.0%
    Claude Fable 5Nearby rank
  3. 86.0%
    Gemini 4 ArgonNearby rank
  4. 86.0%
    GPT-5.6 Terra
  5. 85.6%
    Claude Opus 5Nearby rank
  6. 85.3%
    GPT-5.5Predecessor
  7. 72.2%
    Kimi K3Similar price
  8. 66.0%
    Grok 4.6Similar price
  9. 59.6%

+0.7 pts vs GPT-5.5 (predecessor) · Ahead of 3 of 4 similarly priced models

GPQA diamond

Best score per model · Higher is better

#18 of 161

  1. 95.6%
    Claude Sonnet 5.5Similar price
  2. 94.4%
  3. 94.0%
    Grok 4.6Similar price
  4. 93.5%
    GPT-5.6 SolNearby rank
  5. 93.4%
    Grok 4.5Nearby rank
  6. 93.3%
    GPT-5.6 Terra
  7. 93.3%
    GPT-5.4Nearby rank
  8. 93.2%
  9. 93.1%
    Kimi K3Similar price
  10. 90.7%
    GPT-5.5Predecessor

+2.7 pts vs GPT-5.5 (predecessor) · Ahead of 1 of 4 similarly priced models

OTIS Mock AIME 2024-2025

Best score per model · Higher is better

#13 of 158

  1. 100.0%
    Claude Sonnet 5.5Similar price
  2. 100.0%
    Qwen3.8 Max (0902)Similar price
  3. 99.7%
    Claude Fable 5.2Nearby rank
  4. 99.7%
    GPT-5.6 Terra
  5. 99.4%
    Qwen3.8 MaxNearby rank
  6. 99.4%
  7. 97.2%
    Kimi K3Similar price
  8. 95.6%
  9. 84.4%
    GPT-5.5Predecessor

+15.3 pts vs GPT-5.5 (predecessor) · Ahead of 2 of 4 similarly priced models

SimpleQA Verified

Best score per model · Higher is better

#46 of 87

  1. 73.5%
  2. 63.0%
    GPT-5.5Predecessor
  3. 56.0%
    Grok 4.7Similar price
  4. 50.6%
    Kimi K3Similar price
  5. 46.5%
    Claude Sonnet 5.5Similar price
  6. 45.1%
    GPT-5.4Nearby rank
  7. 44.1%
    Qwen3.6 PlusNearby rank
  8. 43.2%
    GPT-5.6 Terra
  9. 42.9%
  10. 42.5%

-19.8 pts vs GPT-5.5 (predecessor) · Ahead of 0 of 4 similarly priced models

DeepSWE 1.1

Primary coding-agent benchmark · 113 tasks · Data generated 2026-09-22

Official leaderboard
69.6%
pass@1 · highest published configuration
mini-swe-agent · max reasoning
pass@4
88.5%
Average cost / attempt
$4.95
Benchmark runs
4

Score vs cost by reasoning effort

Average cost per attempt (USD) against pass rate

All published configurations

Harness / reasoningpass@1pass@4Cost / attempt
mini-swe-agent · max69.6%88.5%$4.95
mini-swe-agent · xhigh60.2%80.5%$2.13
mini-swe-agent · high53.8%80.5%$1.13
mini-swe-agent · medium35.1%60.2%$0.58
mini-swe-agent · low24.1%44.2%$0.43

pass@1 is the success rate across scored attempts; pass@4 is the share of tasks solved in at least one of four attempts. Costs are reported by DeepSWE for each configuration. These results are not directly comparable to evaluations using different harnesses. Official source JSON.

Reasoning effort

ARC-AGI-2

Score by reasoning effort · Higher is better

GPQA diamond

Score by reasoning effort · Higher is better

OTIS Mock AIME 2024-2025

Score by reasoning effort · Higher is better

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.

To give you the best experience, we use cookies for personalization, insights, and performance. Learn more.