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GPT-5.6 Sol

by OpenAI · Released 2026

OpenAI's frontier GPT-5.6 model for complex professional work. Multimodal (text + vision) with a 1.05M token context window, deep reasoning, and full tool calling.

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LLM Chat

GPT-5.6 Sol

Powered by OpenAI · Transformer (proprietary)

Context Window

1.05M

Parameters

Undisclosed

Max Output

128K

Category

LLM Chat

Overview

GPT-5.6 Sol is the frontier model in OpenAI's GPT-5.6 family — the flagship tier for demanding professional work across coding, science, and analysis. It ships with a 1,050,000 token context window (128K max output) and native vision, accepting both text and image input for document understanding, chart analysis, and visual reasoning.

Sol introduces deeper reasoning with the highest reasoning-effort settings in the family, making it well-suited for long-horizon agentic workflows, multi-step planning, and rigorous tool use. It supports structured outputs, function calling, and prompt caching.

Priced at $5.00 per million input tokens and $30.00 per million output tokens through CallMissed (prompts over 272K tokens bill at a long-context tier), Sol sits at the top of the GPT-5.6 lineup for teams that need frontier capability with vision and the largest context window.

Pricing

MetricPrice
Input /1M tokens₹500.0000
Output /1M tokens₹3000.0000

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

Key Highlights

  • Frontier GPT-5.6 model for complex professional work
  • Native vision — accepts text and image input
  • 1.05M token context window (128K output)
  • Deep reasoning and full tool calling

Technical Details

  • Context window: 1,050,000 tokens (128K max output)
  • Multimodal: accepts text and image input
  • Reasoning-capable with the highest effort settings in the GPT-5.6 family
  • Supports structured outputs, function calling, and prompt caching
  • Available via OpenAI API and CallMissed unified gateway

Strengths

  • Frontier reasoning with native vision support
  • 1.05M context window handles entire codebases and long documents
  • Strongest tier in the GPT-5.6 family for planning and tool use
  • Multimodal — combines text and image input

Limitations

  • Premium pricing relative to Terra, Luna, and open-source models
  • Proprietary and closed-source — no self-hosting option

Use Cases

Complex professional codingLong-horizon agentic workflowsData and document analysisVision and document understanding

API Example

curl https://api.callmissed.com/v1/chat/completions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -d '{"model": "gpt-5.6-sol", "messages": [{"role": "user", "content": "Plan and write a production FastAPI service with tests"}]}'

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

Try GPT-5.6 Sol now

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