Language modelActive

GPT-5.6 Terra

OpenAI

Released: June 26, 2026
Data date: August 11, 2026

Category view

Position within the category

This overview uses only published data from matching cohorts. Missing values never change a rank.

The index averages rank percentiles from 4 documented comparison cohorts. Only models with complete coverage receive a position.

Position: Rank 10 of 26
Index score: 59.1 / 100
Coverage: 4 / 4

Leaderboard

1Claude Opus 588.9 / 100

2Gemini 3.8 Flash88.5 / 100

3Claude Fable 583.2 / 100

9Gemini 3.6 Flash63 / 100

10GPT-5.6 Terra59.1 / 100

11Gemini 3.5 Flash58.7 / 100

25MiMo-V2.5-Pro12.5 / 100

Source: Vals AI, GPQA Diamond Source: Vals AI, Vibe Code Bench v1.1 Source: Vals AI, Terminal-Bench 2.1 Source: Vals AI, Finance Agent (v2)

Measurements

Comparable benchmark results

Each chart contains exactly one source, one measurement series, and one stored comparison cohort. Bars show the position. The measured value appears on the right.

LiveBench

77.94 points · Rank 4 of 4

Comparison cohort: livebench-2026-06-25-max · Data date: September 2, 2026

1.Claude Fable 582.97 points

2.GPT-5.6 Sol81.05 points

3.GPT-5.580.19 points

4.GPT-5.6 Terra77.94 points

4 of 4 model versions shown in this chart. A higher value ranks first.

23 objectively scored tasks across seven categories.

Source: LiveBenchParticipants: 4

LiveBench

90.6 points · Rank 2 of 4

Task: Reasoning · Comparison cohort: livebench-2026-06-25-reasoning-max · Data date: September 2, 2026

1.GPT-5.6 Sol91.7 points

2.GPT-5.6 Terra90.6 points

3.Claude Fable 589.7 points

3.GPT-5.589.7 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Reasoning category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

LiveBench

78.2 points · Rank 4 of 4

Task: Coding · Comparison cohort: livebench-2026-06-25-coding-max · Data date: September 2, 2026

1.Claude Fable 586 points

2.GPT-5.6 Sol83.9 points

3.GPT-5.582.1 points

4.GPT-5.6 Terra78.2 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Coding category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

LiveBench

54.9 points · Rank 3 of 4

Task: Agentic coding · Comparison cohort: livebench-2026-06-25-agentic-coding-max · Data date: September 2, 2026

1.Claude Fable 562.2 points

2.GPT-5.6 Sol56.2 points

3.GPT-5.6 Terra54.9 points

4.GPT-5.554 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Agentic coding category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

LiveBench

94.9 points · Rank 4 of 4

Task: Mathematics · Comparison cohort: livebench-2026-06-25-mathematics-max · Data date: September 2, 2026

1.GPT-5.6 Sol96.2 points

2.Claude Fable 596 points

3.GPT-5.595.9 points

4.GPT-5.6 Terra94.9 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Mathematics category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

LiveBench

79.3 points · Rank 4 of 4

Task: Data analysis · Comparison cohort: livebench-2026-06-25-data-analysis-max · Data date: September 2, 2026

1.GPT-5.581.6 points

2.Claude Fable 580.5 points

3.GPT-5.6 Sol79.8 points

4.GPT-5.6 Terra79.3 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Data analysis category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

LiveBench

82.9 points · Rank 4 of 4

Task: Language · Comparison cohort: livebench-2026-06-25-language-max · Data date: September 2, 2026

1.Claude Fable 590.7 points

2.GPT-5.6 Sol87.7 points

3.GPT-5.587.4 points

4.GPT-5.6 Terra82.9 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Language category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

LiveBench

64.6 points · Rank 4 of 4

Task: Instruction following · Comparison cohort: livebench-2026-06-25-instruction-following-max · Data date: September 2, 2026

1.Claude Fable 575.8 points

2.GPT-5.6 Sol71.8 points

3.GPT-5.570.7 points

4.GPT-5.6 Terra64.6 points

4 of 4 model versions shown in this chart. A higher value ranks first.

Instruction following category inside the same LiveBench release.

Source: LiveBenchParticipants: 4

BrowseComp

87.5% · Rank 2 of 5

Comparison cohort: browsecomp-openai-gpt-5-6-table · Data date: September 2, 2026

1.Claude Mythos 588%

2.GPT-5.6 Terra87.5%

3.Gemini 3.1 Pro Preview85.9%

4.GPT-5.584.4%

5.GPT-5.6 Luna83.3%

5 of 5 model versions shown in this chart. A higher value ranks first.

Cross-vendor comparison table with browsing tools. Exact agent systems differ.

Editorial selection from the vendor table, not a complete extract of the comparison cohort.

Source: OpenAIParticipants: 5

SWE-Bench Pro

63.4% · Rank 4 of 5

Comparison cohort: swe-pro-openai-gpt-5-6-release · Data date: September 2, 2026

1.Claude Mythos 580.3%

2.Claude Fable 580%

3.GPT-5.6 Sol64.6%

4.GPT-5.6 Terra63.4%

5.GPT-5.6 Luna62.7%

5 of 5 model versions shown in this chart. A higher value ranks first.

Comparison table published by OpenAI. Not a Gradually test.

After an audit, OpenAI estimates that about 30% of the public tasks are broken. The result therefore remains a disputed secondary signal. The rows are an editorial selection from the respective comparison table.

Source: OpenAIParticipants: 5

Profile

Specifications and access

Published information about this model. Unknown values are not estimated.

Model type: ProprietarySource
Context window: 1,050,000 tokensSource
Knowledge cutoff: February 16, 2026Source
Notes: Balanced tier of the GPT-5.6 family. Generally available from 2026-07-09. Default model for Free and Go users on ChatGPT Work and Codex, effort-selectable on paid tiers. Matches GPT-5.5 quality at roughly half the price ($2.50 input / $15 output per 1M tokens). Terminal-Bench 2.1 82.5%.Source