GPT-5.6 Terra
ModelActiveby OpenAI · family “gpt-terra”
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic... (description from the OpenRouter listing)
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Epoch Capabilities Index
159.3 #7 of 268
90% CI 156.7 – 162.3
Released
9 Jul 2026
Context window
1.05M tokens
Max output
128K tokens
Input $ / 1M tokens
$2.00
Output $ / 1M tokens
$12.0
Cached input $ / 1M
$0.20
Each benchmark shown separately with its own source
Benchmark results (16)
| Benchmark | Domain | Score | vs best recorded | Setting | Run | Source |
|---|---|---|---|---|---|---|
| Furniture Assembly | multimodal | 54.2% ±6.4 | 65% | max | 10 Sep 2026 | Epoch ↗ |
| LMCA | agents | 54.9% | 81% | max | — | External ↗ |
| DTBench | reasoning | 93.3% | 94% | max | — | External ↗ |
| Mystery Game Puzzles | games | 35.0% ±4.8 | 42% | max | 28 Jul 2026 | Epoch ↗ |
| FrontierMath-Tiers-1-3-v2-Private | math | 86.0% ±2.1 | 92% | max | 9 Jul 2026 | Eval log ↗ |
| FrontierMath-Tier-4-v2-Private | math | 70.7% ±7.2 | 72% | max | 9 Jul 2026 | Eval log ↗ |
| DeepSWE | coding | 69.6% | 94% | max | — | External ↗ |
| APEX-Agents | agents | 58.2% | 79% | max | — | External ↗ |
| Chess Puzzles | games | 54.0% ±5.0 | 75% | max | 9 Jul 2026 | Epoch ↗ |
| SimpleQA Verified | knowledge | 43.2% ±1.6 | 57% | max | 10 Aug 2026 | Epoch ↗ |
| ARC-AGI-2 | reasoning | 83.9% | 88% | max | — | External ↗ |
| WeirdML | coding | 78.3% ±0.0 | 84% | high | — | External ↗ |
| OTIS Mock AIME 2024-2025 | math | 99.7% ±0.3 | 100% | max | 9 Jul 2026 | Epoch ↗ |
| Balrog | games | 53.2% | 78% | max | — | External ↗ |
| GPQA diamond | science | 93.3% ±1.5 | 97% | max | 9 Jul 2026 | Epoch ↗ |
| ARC-AGI | reasoning | 96.5% | 98% | max | — | External ↗ |
Source: Epoch AI Benchmarking Hub (CC BY 4.0). “External” rows are leaderboard results Epoch collects from third parties. Best reported setting per benchmark is shown.
API list price over time
Price history
$ per 1M tokens
4 recorded prices on 17 Jul 2026 (OpenRouter listing + Internet Archive snapshots); re-read on every data refresh, most recently 3h ago. Steps show when the price changed.
Events
- BenchmarkEpoch AI evaluates GPT-5.6 TerraEpoch AI Benchmarking Hub
- Model launchMajorOpenAI releases GPT-5.6 TerraEpoch AI Benchmarking Hub