Anthropic prepares to release Claude Fable 5.5 next week

Anthropic will likely serve more than one model soon, and Claude Fable 5.5 may be first in line. Recent leaks point the same way: partners appear to be testing Fable 5.5, while new Claude codenames keep turning up in third-party tools.

One recent sign that Fable 5.5 may be nearing release came from X user Alex Getman, who shared a screenshot showing Fable 5.5 in Azure's East US 2 model catalog with the status set to "Generally available." The screenshot showed a LiteLLM entry for the model with the same pricing as Fable 5.1, $10 per million input tokens and $50 per million output tokens, along with a 1 million token context window and up to 128K tokens of output.

That said, we'd take it with a grain of salt, since most of those values appear to have been carried over from Fable 5.1, and LiteLLM removed the entry a day later when Azure queries came back empty.

But this isn't the only source that suggests we might see Anthropic's upcoming frontier model soon. A couple of days ago, Lyra (leaker) also said partners had been given access to the upcoming model. There's no release date yet, though the leaker expects one next week.

The same day, Lumina Bench found a "claude-onigiri-eap" codename in Artificial Analysis's frontend, with four effort levels and an Opus 4.8 fallback, a setup typical of Fable and Opus-tier models. It was pulled hours later. Lumina Bench also heard that Claude Code is routing to Fable 5.5 again, which matches what users saw last weekend, when Opus 5.5 started sending some requests to a stronger, unannounced model. Back then, it could have been Fable 5.5 or an Opus 5.6 checkpoint (Highly speculative). But Fable 5.5 seems more likely.

As we mentioned earlier, however, Fable 5.5 might not be the only new model Anthropic will release soon.

A post from Haleemah showed two names spotted in Cognition's Devin CLI: claude-orzata-eap and claude-vanilla-eap. Even user AiBattle on X then mapped six early access names by build. Orzata first showed up on September 21; Boba and Vanilla on September 29; Odango on October 2; and Verrine and Onigiri on October 10.

Odango is the most interesting of the bunch because it didn't stay inside Devin. Damageboy shared a screenshot of what looks like a GitHub Copilot-style agent prompt, where "Claude Odango EAP" sat in the model picker as a selectable option, right between Claude Fable 5.1 and Claude Sonnet 5.5. The screenshot was allegedly shared by the GitHub account on X, but the post appears to have been taken down at the time of writing.

Of course, it's hard to match the codenames to the models since Anthropic hasn't made anything official yet. Still, Onigiri is the favorite for Fable 5.5, while the rest could be anything from Fable variants to the Opus 5.6 people keep speculating about.

On the product side, recent weeks brought hints of Claude Health for web and a mysterious "Iggy", a hidden Voice tab suggesting Anthropic might be building its own voice models, and the beta launch of Claude Dashboards and Motion. This week also brought a new sessions hub in Claude Code Desktop and general availability for Code Review.

Overall, Anthropic is showing no signs of slowing down. The company launched Opus 5.5 less than a month ago, at $4 and $20 per million input and output tokens, roughly matching Fable 5.1 on most tasks. Then they also dropped Sonnet 5.5 and Haiku 5.5 shortly after.

Anthropic hasn't confirmed anything. But if partners really have it, a launch next week wouldn't surprise anyone.