OpenAI / openai/gpt-5.6-terra
GPT-5.6 Terra - access through LLMTR
GPT-5.6 Terra is suited to coding, agent, analysis, and higher-volume assistant flows that need strong performance without Sol-level spend in the OpenAI GPT-5.6 family. It supports a 1.05M context window, 128K max output, text/image input, prompt caching, and true max reasoning effort.
Technical specifications
| Canonical ID | openai/gpt-5.6-terra |
|---|---|
| Provider | OpenAI |
| Context window | 1,050,000 tokens |
| Operations | RESPONSES |
| Modalities | text, image |
Pricing
An 8% platform margin applies to credit top-ups; model usage prices are not separately marked up.
| Operation | Metric | Unit | Price |
|---|---|---|---|
| RESPONSES | INPUT_TEXT | PER_1M_TOKENS | $2.00 |
| RESPONSES | CACHE_READ | PER_1M_TOKENS | $0.200000 |
| RESPONSES | OUTPUT_TEXT | PER_1M_TOKENS | $12.00 |
Example usage
With existing OpenAI SDK flows, change only the base URL and model identifier.
curl https://llmtr.com/v1/chat/completions -H "Authorization: Bearer llmtr-your_key" -H "Content-Type: application/json" -d '{"model":"openai/gpt-5.6-terra","messages":[{"role":"user","content":"Hello"}]}'Guides about this model
- GPT-5.6 Terra Pro isn't a separate model: what the pro-mode difference means - The Terra Pro model page states plainly that this isn't a separate OpenAI native slug; the request routes to the base GPT-5.6 Terra model with pro mode enabled by default in the request body. This article covers what that difference means in practice.
- GPT-5.6 Terra: the 30 July 2026 price drop and the full reasoning_effort range - The Terra Pro article covered this model's relationship to pro mode. This article covers Terra's own price history (which figure is current today) and all six reasoning_effort levels.
Related models
- GPT-6 Astra openai/gpt-6-astra
- GPT-6 Sol openai/gpt-6-sol
- GPT-6 Luna openai/gpt-6-luna
- GPT-5.6 Sol openai/gpt-5.6-sol
- GPT-5.6 Sol Pro openai/gpt-5.6-sol-pro
- GPT-5.6 Terra Pro openai/gpt-5.6-terra-pro
- GPT-5.6 Luna openai/gpt-5.6-luna
- GPT-5.6 Luna Pro openai/gpt-5.6-luna-pro