Claude Fable 5.2 reaches Copilot and AI Gateway, but Anthropic retains your prompts

Claude Fable 5.2, Anthropic’s newest Fable model, is now generally available in GitHub Copilot and on Vercel’s AI Gateway. GitHub reports that in early testing it solved more tasks than Fable 5.1 with fewer steps and tool calls. Results on your own code may differ.

Anthropic keeps prompts and outputs

Fable 5.2 requires data retention. Anthropic keeps prompts and outputs so its safety classifiers can detect harmful use, and says it does not train on them. Vercel puts the retention period at 30 days.

If your team relies on zero data retention (ZDR), meaning the provider stores nothing after answering, this is the part that matters. Vercel says Anthropic does not support ZDR for the model, so AI Gateway returns an error instead of sending the request when ZDR is on for your team.

GitHub says eligible enterprises can use Fable 5, 5.1 and 5.2 with zero data retention through the end of the calendar year, under a time-limited exemption while Anthropic rolls out its Enterprise Frontier Safeguards. Ask your GitHub account team whether your organization qualifies. Other Claude models in Copilot keep operating under ZDR.

Copilot access starts with an admin

Fable 5.2 is available to Copilot Pro+, Max, Business and Enterprise users, and the rollout is gradual. It shows up in the model picker in VS Code, JetBrains IDEs, Xcode, Visual Studio, Eclipse, Copilot CLI, the Copilot coding agent, github.com and the mobile apps.

On Business and Enterprise plans, an administrator must turn on the Fable 5.2 policy in Copilot settings. It is off by default, and enabling it accepts the retention requirement. GitHub bills the model at the provider’s list price under usage-based billing.

Safety classifiers can decline requests

Vercel says Fable 5.2 runs cybersecurity and biology classifiers. If the cybersecurity classifier declines a request, AI Gateway can try other models in order. Vercel’s example falls back to Opus 5.5, then Sonnet 5.5, using a models list under providerOptions.gateway. An app that sends security-related prompts is the one most likely to need that list.

AI Gateway passes through provider pricing with no markup. The model ID is anthropic/claude-fable-5.2, with effort from low to max and high as the API default.

If you have promised customers that AI providers do not store their data, keep Fable 5.2 away from that work. The exception is an enterprise with the GitHub exemption, and that exemption ends with the calendar year.

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