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GPT-6 Sol

by OpenAI · Released 2026

OpenAI's frontier GPT-6 reasoning model for enterprise agents, coding, writing, and complex knowledge work. Multimodal (text + vision) with a 1.05M token context window, adaptive reasoning, and full tool calling.

OpenAI — gpt-6-sol logo
LLM Chat

GPT-6 Sol

Powered by OpenAI · Transformer (proprietary)

Context Window

1.05M

Parameters

Undisclosed

Max Output

128K

Category

LLM Chat

Overview

GPT-6 Sol is OpenAI's frontier GPT-6 reasoning model, built for enterprise agents, coding, writing, and complex knowledge work. It succeeds GPT-5.6 Sol with improved intelligence, token efficiency, and writing quality, and ships with a 1,050,000 token context window (128K max output) plus native vision — accepting both text and image input for document understanding, chart analysis, and visual reasoning.

Sol supports adaptive reasoning, adjusting how much it thinks to the difficulty of the task, with reasoning effort selectable from none through xhigh. It is well-suited for multi-step planning, long-horizon agentic workflows, repository-scale code work, and research and synthesis across very large document sets. It supports structured outputs, function calling, and prompt caching.

Priced at $2.00 per million input tokens and $10.00 per million output tokens through CallMissed (cached input $0.20; prompts over 272K tokens bill at a long-context tier), GPT-6 Sol delivers frontier GPT-6 capability at a lower price than GPT-5.6 Sol.

Pricing

MetricPrice
Input /1M tokens₹200.0000
Output /1M tokens₹1000.0000

1 credit = ₹1 = $0.01 USD. Transparent per-call pricing — you pay only for what you call, with no seat fees or minimums.

Key Highlights

  • Frontier GPT-6 reasoning model for enterprise agents and coding
  • Adaptive reasoning — effort scales with task difficulty
  • Native vision + 1.05M token context window (128K output)
  • Improved writing quality and token efficiency over GPT-5.6 Sol

Technical Details

  • Context window: 1,050,000 tokens (128K max output)
  • Multimodal: accepts text and image input, returns text
  • Reasoning effort: none, low, medium (default), high, xhigh
  • Supports structured outputs, function calling, and prompt caching
  • Knowledge cutoff: April 2026
  • Available via OpenAI API and CallMissed unified gateway

Strengths

  • Frontier GPT-6 reasoning with native vision support
  • 1.05M context window handles entire codebases and long documents
  • Adaptive reasoning keeps simple requests fast and hard ones thorough
  • Lower per-token price than GPT-5.6 Sol

Limitations

  • Function tools on chat completions require reasoning effort none
  • Proprietary and closed-source — no self-hosting option

Use Cases

Enterprise agents and multi-step workflowsSoftware development and codingLong-document and repository analysisResearch and knowledge synthesis

API Example

curl https://api.callmissed.com/v1/chat/completions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -d '{"model": "gpt-6-sol", "messages": [{"role": "user", "content": "Plan and write a production FastAPI service with tests"}]}'

Endpoint: POST /v1/chat/completions · Model ID: gpt-6-sol

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