Solar: Pro 4:thinking API
Upstage's Solar: Pro 4:thinking, 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 solar-pro4:thinking 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
- solar-pro4:thinking
- Maker
- Upstage
- Context window
- 524.3K tokens
- Input price
- $0.150 per million tokens
- Output price
- $0.600 per million tokens
- Providers
- 1 independent provider
- Regions
- us
Providers
- Architect: us, $0.150 input and $0.600 output per million tokens, $0.030 cache read per million tokens, 524.3K tokens of context
Request
curl https://router.inference.ai.exchange/v1/chat/completions \
-H "Authorization: Bearer $LIQUID_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "solar-pro4:thinking",
"messages": [{"role":"user","content":"Say hello."}]
}'Questions
- What is Solar: Pro 4:thinking?
- Solar: Pro 4:thinking is a model from Upstage.
- How much does Solar: Pro 4:thinking cost?
- Offers now ask $0.150 per million input tokens and $0.600 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 Solar: Pro 4:thinking?
- The largest offer takes 524,288 input tokens. A smaller offer can take less. The exchange skips an offer that cannot take your message.
- What can Solar: Pro 4:thinking do?
- Its providers list Reasoning effort, JSON object, JSON schema, Frequency penalty, Logit bias, Log probabilities, Min-p sampling, Presence penalty, Repetition penalty, Seed, Stop sequences, Top-k sampling, Top-p sampling, Text, Tools.
- What inputs and outputs does Solar: Pro 4:thinking support?
- Text → Text.
- Which providers serve Solar: Pro 4:thinking?
- 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 Solar: Pro 4:thinking?
- Send "solar-pro4:thinking" as the model in an OpenAI or Anthropic request. The API section links to setup steps for each client.
- When was Solar: Pro 4:thinking listed?
- The exchange first listed it on 10/10/2026. This is not its release date.