Checked fact 440110 Nov 2026Models and releases

Anthropic's launch post says that in its early testing on the FrontierCode 2.0 evaluation, Fable 5.2 at High effort scored about level with Opus 5.5 at Max effort, for roughly half the cost per task.

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In early testing on the FrontierCode 2.0 evaluation, Fable 5.2 at High effort scored about level with Opus 5.5 at Max effort, for roughly half the cost per task.

What the source said when we opened it, on 10 Nov 2026.

The source

Claude Fable 5.2 and Claude Mythos 5.2
Anthropic · 2026-11-09

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Checked by the notis newsroom on 10 Nov 2026, against the source above.

In the story

Claude Fable 5.2 costs $8 per million input tokens; Mythos 5.2 is vetted-only 10 Nov 2026

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“Anthropic's launch post says that in its early testing on the FrontierCode 2.0 evaluation, Fable 5.2 at High effort scored about level with Opus 5.5 at Max effort, for roughly half the cost per task.” ai notis, checked 10 Nov 2026. Source: Claude Fable 5.2 and Claude Mythos 5.2 (Anthropic). https://ainotis.com/c/4401

As a reference (APA style)

ai notis. (2026, November 10). Anthropic's launch post says that in its early testing on the FrontierCode 2.0 evaluation, Fable 5.2 at High effort scored about level with Opus 5.5 at Max effort, for roughly half the cost per task [Checked claim 4401]. ai notis. https://ainotis.com/c/4401

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