Documentation
Models
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Choosing a model
If you're not sure where to start, use gpt-5.6-sol, the new flagship for complex reasoning and coding. For everyday work choose gpt-5.6-terra; for latency and cost pick gpt-5.6-luna or gpt-5.4-mini. All models use the official OpenAI request format and are available via the Responses API and the official client SDKs.
Frontier models
Prices are per 1M tokens, already 50% below official OpenAI rates.
GPT-5.6-sol
Newnew flagship, best for complex reasoning and coding
- Model ID
gpt-5.6-sol- Input price
- $2.50 / MTok
- Output price
- $15.00 / MTok
- Latency
- Thorough
GPT-5.6-terra
Newbalanced quality and price for everyday work
- Model ID
gpt-5.6-terra- Input price
- $1.25 / MTok
- Output price
- $7.50 / MTok
- Latency
- Fast
GPT-5.6-luna
Newfastest and cheapest of the new family
- Model ID
gpt-5.6-luna- Input price
- $0.50 / MTok
- Output price
- $3.00 / MTok
- Latency
- Fastest
GPT-5.5
previous flagship, strong all-round balance
- Model ID
gpt-5.5- Input price
- $2.50 / MTok
- Output price
- $15.00 / MTok
- Latency
- Fast
GPT-5.4
solid price/quality baseline
- Model ID
gpt-5.4- Input price
- $1.25 / MTok
- Output price
- $7.50 / MTok
- Latency
- Fast
GPT-5.4-mini
fast and cheap workhorse
- Model ID
gpt-5.4-mini- Input price
- $0.38 / MTok
- Output price
- $2.25 / MTok
- Latency
- Faster
Which model should I use?
Pick by the job, not the benchmark. Here's the OpenAI lineup mapped to common tasks - to switch, just pass the model ID in the `model` field.
| Task | Model | Why |
|---|---|---|
| Hardest reasoning & coding | gpt-5.6-sol | New flagship, top of the 5.6 family |
| Everyday work & agents | gpt-5.6-terra | Balanced quality and price |
| Fast, high-volume completions | gpt-5.6-luna | Fastest and cheapest of the 5.6 line |
| Previous-gen flagship | gpt-5.5 | Strong all-rounder, stable and proven |
| Mainstream tasks on 5.4 | gpt-5.4 | Solid price-to-quality baseline |
| Cheapest previous-gen | gpt-5.4-mini | Fast and inexpensive workhorse |
Model FAQ
Which model is best for coding?
For the hardest coding, refactoring and agentic tasks, gpt-5.6-sol is strongest - the new flagship of the 5.6 family. gpt-5.5 remains a solid all-rounder if you want a proven previous-gen model. For fast, cheap day-to-day work, gpt-5.6-luna and gpt-5.4-mini give the best speed-to-cost balance.
What is vibe coding, and which model should I use?
Vibe coding means building software by describing what you want in natural language and letting an AI model write and iterate on the code while you review. Use gpt-5.6-sol for planning and complex changes, and gpt-5.6-terra or gpt-5.4 for day-to-day implementation - connected through Cursor, opencode, Codex CLI or GitHub Copilot by pointing them at our endpoint.
Which OpenAI model is the cheapest?
gpt-5.6-luna is the cheapest and fastest of the new 5.6 line; gpt-5.4-mini is the cheapest previous-gen option. All prices are 50% below the official OpenAI rates - see the pricing page for the full per-model table.
How do I switch between models?
Change the model ID in the standard `model` field of your request. Everything else - your key, base URL, SDK and code - stays the same, so switching models is a one-line change.