GPT-5.6 Terra Pro
OPENAI Developer Architecture Profile
Intelligence (ELO)1479Chatbot Arena Verified
Max Context Limit1,050,000Max Out: 128,000 tokens
Prompt Caching90% OFF$0.20 / 1M cached
Standard API / 1M$14.00🧠 Deep Reasoner
Model Capabilities & Contract SLAs
- Coding & Logic
- Fictional
- Reasoning
- Agentic
- 📋 Strict JSON Schema
- 🛠️ Native Tool Calling
- 🧠 Extended Test-Time Reasoning
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Granular Pricing Matrix
Input Tokens (Standard Prompt)$2.00 / 1M
⚡ Cached Input (Prompt Cache Read)90% OFF$0.20 / 1M
Output Tokens (Completion)$12.00 / 1M
Pricing data via OpenRouter. Sync: 10/2/2026
Evaluate Competitors
VS Engine MatchupGPT-5.6 Terra Pro vs OpenAI: GPT-5.6 TerraVS Engine MatchupGPT-5.6 Terra Pro vs Anthropic: Claude Opus LatestVS Engine MatchupGPT-5.6 Terra Pro vs Google: Gemini 2.5 Flash (batch)VS Engine MatchupGPT-5.6 Terra Pro vs OpenAI: GPT-4o (2024-05-13)VS Engine MatchupGPT-5.6 Terra Pro vs Google: Nano Banana Pro (Gemini 3 Pro Image)VS Engine MatchupGPT-5.6 Terra Pro vs Anthropic: Claude Fable Latest