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Latest model fallback
This is a compact, non-authoritative fallback, not a source for current availability, prices, aliases, or defaults. First search for and fetch current official model guidance at https://developers.openai.com/api/docs/guides/latest-model and the relevant official model page. The fetched official documentation wins if this snapshot has drifted. Disclose any use of this fallback.
Model roles
| Model ID | Documented workload to verify against the current model page |
|---|---|
gpt-6 |
GPT-6 family alias; verify its currently documented routing and availability. |
gpt-6-astra |
Quality-first flagship, reasoning, and difficult coding work. |
gpt-5.6-terra |
Balanced quality, latency, and cost. |
gpt-5.6-luna |
Primary choice for faster or cheaper workloads. |
Use https://developers.openai.com/api/docs/guides/latest-model/gpt-6-astra.md#migration-quickstart for an actual GPT-6 migration and https://developers.openai.com/api/docs/guides/latest-model/gpt-6-astra.md#prompting-best-practices for requested GPT-6 prompting. Open and read the relevant page before recommending a request shape, reasoning setting, endpoint, tool behavior, or migration.
Explicitly requested existing models
| Model ID | Boundary |
|---|---|
gpt-4.1 |
Preserve only when the user explicitly requests this model or existing migration target; search and fetch its own current official guide. |
gpt-5.4 |
Preserve only when the user explicitly requests this model or existing migration target; search and fetch its own current official guide. |
Do not promote a legacy model as the current default, substitute it into an unrelated task, or replace an explicitly requested legacy target with GPT-6 Astra. Recommend a specialized image, audio, realtime, coding, moderation, or embedding model only after verifying the requested modality against current official documentation.
Verify GPT-6 Pro against current official Responses and model documentation before describing model IDs, reasoning modes, request parameters, or account availability; do not invent a separate gpt-6-pro model slug.