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GPT-6.1 Sol

by OpenAI · Released 2026

OpenAI's GPT-6.1 Sol delivers near-Astra performance for complex coding, computer use, and professional work at a lower cost. Multimodal (text + vision) with a 1.05M token context window, always-on reasoning, and full tool calling.

OpenAI — gpt-6.1-sol logo
LLM Chat

GPT-6.1 Sol

Powered by OpenAI · Transformer (proprietary)

Context Window

1.05M

Parameters

Undisclosed

Max Output

128K

Category

LLM Chat

Overview

GPT-6.1 Sol is OpenAI's near-Astra model for complex work at a lower cost, optimized for complex coding, computer use, and professional tasks. It ships with a 1,050,000 token context window (922K max input, 128K max output) plus native vision — accepting both text and image input for document understanding, screenshots, and visual reasoning.

Sol always reasons, with reasoning effort selectable from low through xhigh (medium by default). It is well-suited for repository-scale code work, long-horizon agentic workflows, multi-step planning, and professional analysis across very large document sets. It supports structured outputs, function calling, streaming, and prompt caching.

Priced at $2.083 per million input tokens and $10.42 per million output tokens through CallMissed (cached input $0.1042; prompts over 272K tokens bill at a long-context tier), GPT-6.1 Sol matches the per-token price of GPT-6 Sol with half the cached-input rate.

Pricing

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

1 credit = ₹1 ≈ US$0.0104 (US$1 = ₹96). Transparent per-call pricing — you pay only for what you call, with no seat fees or minimums.

Key Highlights

  • Near-Astra performance for complex work at a lower cost
  • Optimized for complex coding, computer use, and professional tasks
  • Native vision + 1.05M token context window (128K output)
  • Cached input at 5% of the input price

Technical Details

  • Context window: 1,050,000 tokens (922K max input, 128K max output)
  • Multimodal: accepts text and image input, returns text
  • Reasoning effort: low, medium (default), high, xhigh
  • Supports structured outputs, function calling, streaming, and prompt caching
  • Knowledge cutoff: April 2026
  • Available via OpenAI API and CallMissed unified gateway

Strengths

  • Near-Astra capability at the GPT-6 Sol price point
  • 1.05M context window handles entire codebases and long documents
  • Native vision for screenshots, charts, and documents
  • Low cached-input rate for repeated long prompts

Limitations

  • Reasoning cannot be switched off — none and minimal run at low effort
  • Only the default temperature is supported
  • Proprietary and closed-source — no self-hosting option

Use Cases

Complex coding and refactoringComputer-use and agentic workflowsProfessional analysis and writingLong-document and repository analysis

API Example

curl https://api.callmissed.com/v1/chat/completions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -d '{"model": "gpt-6.1-sol", "messages": [{"role": "user", "content": "Refactor this module and add tests for every public function"}]}'

Endpoint: POST /v1/chat/completions · Model ID: gpt-6.1-sol

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