Anthropic debuts Claude Fable, Mythos 5.2 models, priced 20% below OpenAI’s GPT-6 Astra
Anthropic debuted Claude Fable 5.2 and Mythos 5.2 on Monday, the company’s answer to OpenAI’s GPT-6 Astra, which came out in early September.
- Anthropic says the new models "show improvements in areas like coding, reasoning, and vision," as well as in communicating more clearly with users.
- Fable 5.2 and Mythos 5.2 are 20% cheaper than Astra for ordinary input and output tasks, at $8 per million input tokens and $40 per million output tokens, compared to $10 and $50, respectively, for GPT-6 Astra.
- Anthropic’s new models are 80% cheaper, at 20 cents per million cached tokens compared to one dollar per million cached tokens for GPT-6 Astra.
The company claims an unnamed security company “found that one in six confirmed bugs found by Claude Mythos 5.2 were missed by all of the other frontier models they tested.” Late last week, OpenAI debuted a cybersecurity-focused model, GPT-6 Cyber.
Anthropic is announcing two new models today: Claude Fable 5.2 and Claude Mythos 5.2, which it says are designed to take on "daunting" technical challenges.
- In light of OpenAI making headlines for solving mathematics proofs that have eluded academics for decades—most notably the 90-year-old Navier–Stokes Millennium Prize Problem—Anthropic is highlighting its new models’ mathematics chops as well.
- The new models, which could be Anthropic’s last big releases before its IPO, claim to offer higher performance than Astra at a lower price point—a key factor for earning and retaining customers in a world where professionals seem quick to switch to models based on cost, as long as the performance holds up.
- While Anthropic’s Claude Code product gained an early lead among programmers, OpenAI’s Codex has gained ground in recent months due to its lower pricing, The Information reported in late October.
- Fable 5.2 and Mythos 5.2 perform better than its competitors on coding evaluation benchmarks, Anthropic said, noting that over 90% of the company’s own code is written by AI.
- The company claims the new models show improvements in coding, reasoning, and vision, and can generate outputs faster than the 5.1 versions of the Fable and Mythos models.
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