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GPT-5.6 Sol

Frontier GPT-5.6 reasoning for complex professional work.

GPT-5.6 Sol is the highest-reasoning model in the 5.6 family — the one to pick when a professional task is complex enough to want the best answer the family can give.

  • Complex reasoning
  • Professional work
  • Coding
Get your API keyTry in playgroundCompare models

Model details

Context window
1.1M tokens
Max output
128K tokens
Input
Text, images
Output
Text
Capabilities
Reasoning, Vision, Tool calling, Streaming, JSON output
Interfaces
OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses

Pricing

Prices use the units shown below. No gateway fees. Usage, size and model options may affect the total.

GPT-5.6 Sol pricing.
MetricPrice
/ 1M input tokens$4
/ 1M output tokens$20
/ 1M cached input tokens$0.4
/ 1M cache write tokens (5 min)$5
/ web search$0.01
/ 1M input tokens · Up to 272K input tokens$4
/ 1M output tokens · Up to 272K input tokens$20
/ 1M cached input tokens · Up to 272K input tokens$0.4
/ 1M cache write tokens (5 min) · Up to 272K input tokens$5
/ 1M input tokens · Above 272K input tokens$8
/ 1M output tokens · Above 272K input tokens$30
/ 1M cached input tokens · Above 272K input tokens$0.8
/ 1M cache write tokens (5 min) · Above 272K input tokens$10

Why teams pick it

  • Highest reasoning capability in the GPT-5.6 family
  • Vision and tool calling included
  • Over 1M tokens of context

Call GPT-5.6 Sol

GPT-5.6 Sol answers on any of the APIs below — pick the one your code already speaks and just swap in your Cloakray key.

/v1/chat/completionsOpenAI-style Chat Completions · openai SDK or plain HTTP
curl https://api.cloakray.com/v1/chat/completions \
  -H "Authorization: Bearer ckr_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-5.6-sol",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'
/v1/messagesAnthropic-style Messages · @anthropic-ai/sdk SDK or plain HTTP
curl https://api.cloakray.com/v1/messages \
  -H "Authorization: Bearer ckr_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-5.6-sol",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'
/v1/responsesOpenAI-style Responses · openai SDK or plain HTTP
curl https://api.cloakray.com/v1/responses \
  -H "Authorization: Bearer ckr_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-5.6-sol",
  "input": "Hello"
}'

Conversation compaction is also available at POST /v1/responses/compact.

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