GPT-5.6 Terra
GPT-5.6 Terra is an AI model from OpenAI, released on 2026-06-26.
Data sourced primarily from official releases (GitHub, Hugging Face, papers), then benchmark leaderboards, then third-party evaluators. Learn about our data methodology
Model basics
Open source & experience
Official resources
API details
| Type | Condition | Input | Output |
|---|---|---|---|
| Text | - | $2.00/ 1M | $12.00/ 1M |
| Type | Condition | Input | Output |
|---|---|---|---|
| Text | - | $4.00/ 1M | $18.00/ 1M |
| Type | TTL | Write | Read |
|---|---|---|---|
| Text | 30m | $2.50/ 1M | $0.200/ 1M |
“—” means the modality is not billed in that direction, or the vendor has not published a price for it.
Benchmark Results
GPT-5.6 Terra currently shows benchmark results led by FrontierMath v2 (4 / 58, score 85.96), GPQA Diamond (19 / 274, score 93.31), Context Arena (11 / 126, score 92.17). This page also consolidates core specs, context limits, and API pricing so you can evaluate the model from benchmark results and deployment constraints together.
General Knowledge
5 evaluationsGeneral Evaluation
3 evaluationsWriting and Creative Capabilities
1 evaluationsAI Agent - Tool Usage
4 evaluationsCoding and Software Engineer
6 evaluationsAgent Level Benchmark
3 evaluationsProductivity Knowledge
3 evaluationsMath and Reasoning
2 evaluationsCompare with other models
- Earlier versionGPT-5.6 Terra vs GPT-5.513 benchmarks
- Earlier versionGPT-5.6 Terra vs GPT-5.411 benchmarks
- Peer modelGPT-5.6 Terra vs Claude Sonnet 511 benchmarks
- Peer modelGPT-5.6 Terra vs GLM-5.210 benchmarks
- Peer modelGPT-5.6 Terra vs Gemini 3.5 Flash9 benchmarks
Want a custom combination? Open the compare tool
Publisher
Model Overview
GPT-5.6 Terra
GPT-5.6 Terra is OpenAI's balanced mid-tier model in the GPT-5.6 family, first previewed on June 26, 2026 and made generally available on July 9, 2026. It targets high-concurrency production workloads — customer support, internal tooling, document analysis — delivering roughly GPT-5.5-level capability at about half the price. The family also includes Sol (the flagship, for the hardest coding/research/security tasks) and Luna (the most cost-efficient tier).
On Artificial Analysis's Intelligence Index (max reasoning), Terra scores 55 versus Sol's 59, at roughly half the cost per task (~$0.55 vs ~$1.04). It reaches 87.40 on Terminal-Bench 2.1, 69.60 on DeepSWE, 77.4 on the AA Coding Agent Index, 50.4 on Agents' Last Exam, and 65.14% accuracy on the Vals Index. Independent testing by CodeRabbit found Terra completes 40.7% of long-horizon coding tasks (versus Sol's 63.7%) while producing notably more verbose output per task — best suited to well-scoped, cost-sensitive coding work rather than long or highly complex jobs.
Terra shares OpenAI's GPT-5.6 system card with Sol and Luna, including "High" Preparedness Framework ratings for cybersecurity and biological/chemical risk; see the GPT-5.6 Sol page for the detailed safety-evaluation breakdown.
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