Gemini 4 Argon
Claude Opus 5.5
Muse Wonder
MiMo-V2.6-Pro
Qwen3.8-Max
Kimi K3
GLM-5.3
ERNIE 5.1
DeepSeek-V4.1-Flash-20260910
Grok 4.20 Beta
amazon-nova-experimental-chat
Dola Seed 2.0 Pro
NVIDIA-Nemotron-3-Ultra-550B-A55B
Gemma 4 31B
Step 5 Preview
GPT-5.6 Terra
GPT-5.6 Terra is a proprietary model from OpenAI, released Jul 9, 2026. It ranks #55 of 351 on the LMArena text leaderboard with a rating of 1448. It costs $2 per million input tokens and $12 per million output tokens, with a 1.1M-token context window.
- Developer
- OpenAI
- Released
- Jul 9, 2026
- Context window
- 1.1M
- Price in / out, per 1M tokens
- $2 / $12
- Weights
- Proprietary
- Inputs
- Files, Images, Text
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Terminal-Bench 4.0Coding | 22.73% | 28 / 55 | $5.60 | |
| SWE-benchCoding | 95.40% | 5 / 85 | $0.40 | |
| Vibe Code BenchCoding | 74.59% | 38 / 115 | $7.89 | |
| LiveCodeBenchCoding | 85.93% | 27 / 143 | $2 / $12 | |
| Tax Agent BenchFinance | 30.04% | 29 / 76 | $4.83 | |
| Legal Research BenchLaw | 41.35% | 28 / 85 | $7.91 | |
| MedCodeMedicine | 43.41% | 45 / 107 | $2 / $12 | |
| GPQA DiamondReasoning | 90.91% | 24 / 138 | $2 / $12 | |
| MMLU-ProReasoning | 86.66% | 40 / 138 | $2 / $12 | |
| MMMUReasoning | 86.47% | 20 / 93 | $2 / $12 | |
| Terminal-Bench ScienceReasoning | 10.00% | 18 / 42 | $5.19 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1448 | 55 / 351 | 46.5K |
| CodingLMArena | 1486 | 44 / 346 | 12.2K |
| MathLMArena | 1466 | 52 / 339 | 2.1K |
| Creative writingLMArena | 1413 | 77 / 349 | 9.9K |
| Instruction followingLMArena | 1455 | 46 / 351 | 16.6K |
| Hard promptsLMArena | 1469 | 47 / 351 | 30.2K |
| Multi-turnLMArena | 1453 | 62 / 349 | 7.4K |
| Long queriesLMArena | 1453 | 60 / 330 | 21.5K |
| ExpertLMArena | 1496 | 30 / 305 | 5.4K |
| Legal and governmentIndustries | 1462 | 49 / 325 | 3.9K |
| Medicine and healthcareIndustries | 1432 | 108 / 325 | 3.3K |
| Business and financeIndustries | 1448 | 47 / 344 | 8.6K |
| ChineseLanguages | 1514 | 36 / 328 | 3.7K |
| SpanishLanguages | 1448 | 64 / 249 | 1.4K |
| GermanLanguages | 1461 | 38 / 261 | 732 |
| FrenchLanguages | 1466 | 55 / 252 | 1.5K |
| JapaneseLanguages | 1453 | 30 / 236 | 761 |
| WebDevLMArena | 1521 | 55 / 124 | 14.5K |
| VisionLMArena | 1271 | 43 / 146 | 11.8K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (GPT-5.6 Terra (xHigh), GPT-5.6 Terra (xHigh, Codex Harness)).
Compare GPT-5.6 Terra
OpenAI
The lab behind GPT and ChatGPT, which brought large language models to hundreds of millions of people. Founded 2015, based in San Francisco. openai.com
Questions
Who makes GPT-5.6 Terra?
GPT-5.6 Terra is made by OpenAI, founded 2015 and based in San Francisco.
How much does GPT-5.6 Terra cost?
$2 per million input tokens and $12 per million output tokens, at its provider’s list price.
What is GPT-5.6 Terra’s context window?
1.1M tokens (1,050,000).
How does GPT-5.6 Terra rank?
#55 of 351 on LMArena’s text leaderboard, rated 1448 (95% interval 1444–1452) from 46,470 votes, as of Oct 22, 2026.
Is GPT-5.6 Terra open source?
No. GPT-5.6 Terra is proprietary and served through its provider’s API.