GPT-5.6 Sol API
LLMGPT-5.6 Sol is the featured top-rate GPT-5.6 coding route, with 1M context, vision, and structured tool use for agent workflows.
- Input · USD / 1M tokens$0.45 USDOfficial price
$4 USD - Output · USD / 1M tokens$2.7 USDOfficial price
$20 USD - Savings91%
- Context1M
- Last verified2026-09-16
- View tool pricing and billing rules
What are we making today?
Bring an idea, a question, or a first draft.
01
What this model is for
GPT-5.6 Sol is the featured top-rate GPT-5.6 coding route, with 1M context, vision, and structured tool use for agent workflows.
GPT-5.6 Sol is the featured and highest-priced route in OmniaKey's three-model GPT-5.6 family. It is intended for coding work where you want the family's top option before optimizing for per-token cost, including unfamiliar repositories, multi-step changes, and reviews that depend on evidence across many files.
The route lists a 1M context window, visual input, and structured tool use. Use the gpt-5.6-sol model ID with the OpenAI-compatible chat-completions endpoint, or select it in Codex, Cursor, Cline, and Aider when the client exposes custom model routing.
Best-fit coding workloads
Repository-scale analysis
Trace behavior across many files before planning a refactor or debugging a cross-package failure.
High-stakes code review
Inspect implementation, tests, and edge cases when missed behavior carries a meaningful cost.
Structured coding agents
Pair long context with search, test, and repository tools in multi-step agent workflows.
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Technical specification
Catalog facts and integration details verified for this route.
- Model ID
- gpt-5.6-sol
- Context
- 1M
- Inputs and tools
- Vision · Tool use
- API endpoint
- /v1/chat/completions
- Cache hit / 1M
- $0.045 USD
- Coding clients
- Codex · Cursor · Cline · Aider
Limits to plan around
- Sol has the highest listed input and output price in the GPT-5.6 family. Terra or Luna may be more economical for routine, high-volume iterations.
- The 1M figure is a maximum context listing, not a guarantee that every client accepts or benefits from an unfiltered 1M-token request.
- OpenAI-compatible clients differ in streaming and tool-call handling. Validate the exact SDK or agent version before relying on it in automation.
03
Compare nearby models
Compare workload fit and current listed token rates before choosing a route.
| Model | Best for | Context | Input | Output |
|---|---|---|---|---|
| GPT-5.6 SolThis page gpt-5.6-sol | The featured GPT-5.6 route for the hardest coding, analysis, and review work in the family. | 1M | $0.45 USD Official price $4 USD | $2.7 USD Official price $20 USD |
| GPT-5.6 Terra gpt-5.6-terra | A middle-rate GPT-5.6 option for regular development where Sol's top family position is unnecessary. | 1M | $0.3 USD Official price $2 USD | $1.8 USD Official price $12 USD |
| GPT-5.6 Luna gpt-5.6-luna | Frequent, cost-sensitive iterations where the catalog's fast label and lowest 5.6 rate lead. | 1M | $0.2 USD Official price $0.2 USD | $1.2 USD Official price $1.2 USD |
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SDK quickstarts
Use one base URL and model ID from cURL, Python, or TypeScript.
curl https://api.omniakey.com/v1/chat/completions \
-H "Authorization: Bearer $OMNIAKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-sol",
"messages": [
{"role": "user", "content": "Review this pull request"}
],
"stream": true
}'05
Estimate token cost
Enter expected input and output tokens to compare current listed rates.
- OmniaKey estimate
- $0.099
- Official-rate estimate
- $0.80
- Estimated savings
- $0.701
Estimate covers input and output tokens only. Cache usage, retries, tools, and client-side token accounting can change the final charge.
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Related coding guides
Deeper selection, setup, and troubleshooting guidance for this model family.
GPT-6 Astra vs GPT-5.6 Sol: When Does the Upgrade Pay Off?
Keep Sol when it already passes a bounded task. Test Astra when failed attempts, long tool chains, or human repair cost more than its higher token rate.
Read guideBest GPT-5.6 Model for Codex
Start with Sol for difficult open-ended work, Terra for everyday coding, and Luna for clear repeatable tasks where speed and cost matter most.
Read guideClaude Opus 5 vs GPT-5.6 Sol for Coding
Choose Opus 5 when ambiguous, long-horizon repository work rewards deeper investigation; choose GPT-5.6 Sol when you want the GPT-5.6 frontier model and its Responses-native tool stack.
Read guide07
Sources and verification
Model facts and links were checked on 2026-09-16. Provider documentation remains the authority for upstream behavior.
Frequently asked questions
How much does GPT-5.6 Sol cost on OmniaKey?
OmniaKey currently charges $0.45 USD per 1M input tokens and $2.7 USD per 1M output tokens, in USD. Direct provider rates are separate and may change with input context length.
What is the context window for GPT-5.6 Sol?
The listed context window is 1M. Actual usable limits can also depend on the client and upstream request format.
Should I choose GPT-5.6 Sol, Terra, or Luna for coding?
Start with Sol for the hardest or highest-risk work, Terra for general development at a middle listed rate, and Luna for frequent cost-sensitive iterations. Confirm the choice with representative tasks because price and family position do not replace workload testing.
Can GPT-5.6 Sol be used in Codex through OmniaKey?
Yes. The catalog lists Codex compatibility. Configure the OmniaKey base URL and API key, select gpt-5.6-sol, and use the linked compatibility kit to separate model-access, API, streaming, tool-call, and CLI issues.
Does GPT-5.6 Sol support streaming and function calls?
The route is listed with tool use, and this page includes OpenAI-compatible streaming and structured-tool examples. Exact behavior still depends on the client and request format, so test both paths before production automation.