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OpenAI · released 2026-07-09

GPT-5.6 Terra

Measured on 183 benchmarks across 6 reasoning efforts.

31.6

#20 of 61 models · best at max

Reasoning efforts in this ranking

max31.6#53 of 139
xhigh26.4#78 of 139
high23.1#88 of 139
medium19.2#101 of 139
low17.7#108 of 139
none11.2#125 of 139

Strengths

  • GPT-5.6 Terra
  • 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%26.8% est.#16 of 61
  2. Terminal-Bench v4-AA10%35.4%#17 of 61
  3. AA-Briefcase v1.115%1333#36 of 61
  4. AutomationBench-AA5%59.6%#23 of 61
  5. Terminal-Bench-Science-AA15%13.8%#16 of 61
  6. HLE-Diamond10%28.8%#18 of 61
  7. CritPt v2 Hard Subset10%39.1% est.#20 of 61
  8. AA-Omniscience v1.1 Accuracy10%42.3%#19 of 61
  9. AA-Omniscience v1.1 Non-hallucination5%10.6%#58 of 61
  10. GDP.pdf5%24.0%#14 of 61

Bars show where GPT-5.6 Terra sits among the 61 ranked models on each benchmark (right is best); the tick is the field median.

Cost and speed

against 61 ranked models

Output speed

#20 fastest of 52

137 tok/sat max

Time to first token

#46 quickest of 52

2.5 minat max

Token price

$0.331 per 1M tokens at API prices$0.0091 on ChatGPT Pro 10x

95.2% cache read · 3.44% fresh input · 0.94% cache write · 0.40% output

Measured from T3 Code usage in Codex, Oct 27 to Nov 2, medium confidence. One app’s users, not everyone’s. $0.304 at the standard 97 / 2.5 / 0.5 mix.

Not measured for GPT-5.6 Terra: cost per task, time per task, output tokens per task (no published API price yet).

This ranking’s benchmarks

8 of 10 measured

agentic

AutomationBench-AA

241 results
  1. #45max of 24159.6%
  2. #104xhigh of 24147.1%
  3. #110high of 24142.0%
  4. #129medium of 24133.5%
  5. #132low of 24129.1%
  6. #166none of 24112.5%

Leader: Gemini 4 Carbon · 77.8%

agentic

AA-Briefcase v1.1

247 results
  1. #76max of 2471333
  2. #78xhigh of 2471332
  3. #102high of 2471202
  4. #132medium of 2471039
  5. #134low of 2471015
  6. #148none of 247946

Leader: Sonnet 5.5 · 1814

economics

GDP.pdf

240 results
  1. #41xhigh of 24024.6%
  2. #47max of 24024.0%
  3. #70high of 24020.8%
  4. #91low of 24017.6%
  5. #98medium of 24017.0%
  6. #140none of 24011.2%

Leader: Muse Wonder Full · 32.6%

reasoning

HLE-Diamond

142 results
  1. #43max of 14228.8%
  2. #49xhigh of 14224.7%
  3. #59high of 14221.0%
  4. #74medium of 14216.1%
  5. #85low of 14214.1%
  6. #125none of 1424.8%

Leader: Gemini 4 Carbon · 69.1%

knowledge

AA-Omniscience v1.1 Accuracy

111 results
  1. #45max of 11142.3%
  2. #48xhigh of 11141.3%
  3. #49high of 11141.2%
  4. #52medium of 11140.5%
  5. #53low of 11139.8%
  6. #71none of 11132.6%

Leader: Fable 5.1 · 68.4%

knowledge

AA-Omniscience v1.1 Non-hallucination

111 results
  1. #102max of 11110.6%
  2. #103xhigh of 1119.9%
  3. #104high of 1119.0%
  4. #105medium of 1118.7%
  5. #106low of 1118.7%
  6. #111none of 1114.4%

Leader: Gemini 4 Carbon · 95.8%

reasoning

Terminal-Bench-Science-AA

115 results
  1. #43max of 11513.8%

Leader: Gemini 4 Carbon · 64.8%

coding

Terminal-Bench v4-AA

238 results
  1. #40max of 23835.4%
  2. #104xhigh of 23810.1%
  3. #140high of 2381.5%
  4. #141low of 2381.5%
  5. #148medium of 2381.0%
  6. #164none of 2380.5%

Leader: Kimi K3.1 · 67.2%

All 183 benchmarks

show 175 more