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GPT-5.6 Terra

by OpenAI · Released 2026

GPT-5.6 model that balances intelligence and cost. Multimodal (text + vision), 1.05M context, reasoning, and tool calling — competitive with GPT-5.5 at roughly half the price.

OpenAI — gpt-5.6-terra logo
LLM Chat

GPT-5.6 Terra

Powered by OpenAI · Transformer (proprietary)

Context Window

1.05M

Parameters

Undisclosed

Max Output

128K

Category

LLM Chat

Overview

GPT-5.6 Terra is the balanced tier of OpenAI's GPT-5.6 family, offering competitive performance with the previous GPT-5.5 flagship at roughly half the cost. It keeps the full 1,050,000 token context window (128K max output) and native vision, making it a strong everyday-work model for teams that want frontier-class quality without flagship pricing.

Terra supports reasoning, structured outputs, function calling, and prompt caching, and handles both text and image input. It is a natural default for most production workloads — coding, writing, analysis, and agentic tool use — where Sol's peak capability is more than the task requires.

Priced at $2.50 per million input tokens and $15.00 per million output tokens through CallMissed (long-context tier over 272K tokens), Terra is the value-forward middle of the GPT-5.6 lineup.

Pricing

MetricPrice
Input /1M tokens₹250.0000
Output /1M tokens₹1500.0000

1 credit = ₹1 = $0.01 USD. Prices shown from provider; CallMissed passes through with ~35% markup.

Key Highlights

  • Balances intelligence and cost
  • Competitive with GPT-5.5 at roughly half the price
  • Native vision + 1.05M token context window
  • Reasoning and full tool calling

Technical Details

  • Context window: 1,050,000 tokens (128K max output)
  • Multimodal: accepts text and image input
  • Reasoning-capable for planning and multi-step tasks
  • Supports structured outputs, function calling, and prompt caching
  • Available via OpenAI API and CallMissed unified gateway

Strengths

  • Competitive with GPT-5.5 at roughly half the cost
  • 1.05M context window with native vision
  • Strong balance of capability, speed, and price
  • Multimodal — combines text and image input

Limitations

  • Not quite Sol-level on the hardest reasoning tasks
  • Proprietary and closed-source — no self-hosting option

Use Cases

Everyday production AICode generationContent creationVision and document understanding

API Example

curl https://api.callmissed.com/v1/chat/completions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -d '{"model": "gpt-5.6-terra", "messages": [{"role": "user", "content": "Refactor this module and explain the tradeoffs"}]}'

Endpoint: POST /v1/chat/completions · Model ID: gpt-5.6-terra

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