GPT-5.2 Chat vs GPT-5.6 Terra
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-5.2 Chat and GPT-5.6 Terra.
GPT-5.2 Chat
GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
GPT-5.6 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...
Technical Specifications
| Specification | GPT-5.2 Chat | GPT-5.6 Terra |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Window | 128,000 tokens | 1,050,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | beta |
| API Available | Yes | Yes |
| Released Date | 2025-12-10 | 2026-07-09 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.2 Chat
$1.75
GPT-5.6 Terra
$2.50
Output Price per Million Tokens
GPT-5.2 Chat
$14.00
GPT-5.6 Terra
$15.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-5.2 Chat Quirks & Gotchas
No developer gotchas reported.
GPT-5.6 Terra Quirks & Gotchas
No developer gotchas reported.