GPT 5.6 Sol API

OpenAI's GPT 5.6 Sol, through an OpenAI-compatible API. Providers quote it on an open exchange, and each request goes to the offer with the lowest estimated charge that meets your rules.

Providers compete for each request. The exchange ranks the offers that meet your rules by estimated charge. It fixes your maximum charge before the first token, and you pay for the tokens that the model uses.
The OpenAI and Anthropic APIs. Use the OpenAI or Anthropic SDK that you have. Set the base URL and your key, and send gpt-5.6-sol as the model.
Your data rules. Send x-liquid-retention: none and only offers whose provider does not keep your content compete for the request.

Facts

Model name: gpt-5.6-sol
Maker: OpenAI
Context window: 1M tokens
Input price: $5.000 per million tokens
Output price: $37.500 per million tokens
Providers: 1 independent provider
Regions: us

Providers

Pera: us, $5.000 input and $37.500 output per million tokens, $5.000 cache read per million tokens, 1M tokens of context

Scores

HLE: 42.2, #37 of 273
GPQA: 92.6, #18 of 250
AA-LCR: 80.3, #37 of 237
SciCode: 57.4, #19 of 123
Terminal-Bench Hard: 62.9, #1 of 166
τ²-Bench: 81.0, #62 of 169
IFBench: 69.6, #43 of 178
SimpleQA Verified: 69.7, #10 of 126

Scores: Artificial Analysis (https://artificialanalysis.ai/)

Scores: Epoch AI, 'Capabilities & Benchmarking' (https://epoch.ai/benchmarks)

Request

curl https://router.inference.ai.exchange/v1/chat/completions \
  -H "Authorization: Bearer $LIQUID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-sol",
    "messages": [{"role":"user","content":"Say hello."}]
  }'

Questions

What is GPT 5.6 Sol?: GPT 5.6 Sol is a model from OpenAI.
How much does GPT 5.6 Sol cost?: Offers now ask $5.000 per million input tokens and $37.500 per million output tokens. A job pays for the tokens it uses. The exchange picks the cheapest eligible offer.
What is the context length of GPT 5.6 Sol?: The largest offer takes 1,000,000 input tokens. One job can generate up to 128,000 tokens. A smaller offer can take less. The exchange skips an offer that cannot take your message.
What can GPT 5.6 Sol do?: Its providers list Vision, Reasoning effort, JSON object, JSON schema, Frequency penalty, Presence penalty, Seed, Stop sequences, Top-p sampling, Text, Tools.
What inputs and outputs does GPT 5.6 Sol support?: Text · Images → Text.
Which providers serve GPT 5.6 Sol?: 1 independent provider quote it now, with 1 offer. The table above ranks them by the cost of a typical job.
How do I call GPT 5.6 Sol?: Send "gpt-5.6-sol" as the model in an OpenAI or Anthropic request. The API section links to setup steps for each client.
When was GPT 5.6 Sol listed?: The exchange first listed it on 9/29/2026. This is not its release date.