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...
Tested on 31 benchmarks · BenchGecko score 76.5. Top scores: OTIS Mock AIME 2024-2025 (99.7%), ARC-AGI (96.5%), Artificial Analysis · GPQA Diamond (92.5%).
gpt-oss-120b (free) scores 74.2 (97% as good) at $0.00/1M input · 100% cheaper
Unusual and adversarial machine learning challenges. Tests robustness of reasoning about edge cases in ML systems.
Abstraction and Reasoning Corpus. Tests fluid intelligence through novel visual pattern recognition puzzles. Core measure of general intelligence.
ARC-AGI 2, harder sequel to ARC. More complex abstract reasoning patterns that test generalization ability beyond training data.
Deceptively simple questions that humans find easy but AI models often get wrong. Tests common sense and reasoning gaps.
Mock AIME (American Invitational Mathematics Exam) problems from OTIS. Tests mathematical competition performance.
- Typemultimodal
- Context1.1M tokens (~525 books)
- ReleasedJul 2026
- LicenseProprietary
- StatusActive
- Cost / Message~$0.016
Frequently Asked Questions
Key facts · as of 2026-10-05
- GPT-5.6 Terra by OpenAI. BenchGecko score 76.5, rank 25 of 312 scored models (normalized average of public benchmark scores).
- List price $2.00 input · $12.00 output per 1M tokens (as of 2026-10-05).
- Sold by 7 providers (as of 2026-10-05): OpenAI $1.00 in / $6.00 out · Azure $2.00 in / $12.00 out · OpenAI $2.00 in / $12.00 out · Amazon Bedrock $2.20 in / $13.20 out · Azure $2.20 in / $13.20 out · and 2 more. Every provider
How to cite · data as of 2026-10-05
GPT-5.6 Terra · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/gpt-5-6-terra
Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP