Anthropic's recent price cuts and open-sourcing of Diamond achievements, Claude Fable 5 directly make GPT-5.5 look like a little brother, and Mythos level is finally no longer just a PowerPoint presentation.

CryptoWorld News reports that Anthropic has launched a new flagship large model, Claude Fable 5, the first Mythos-level model opened to the public. The new model is priced at $10 per million input tokens and $50 per output, more than halving the price compared with the beta version. Claude Fable 5 scored 29.3% on FrontierCode’s Diamond difficulty assessment, far surpassing GPT-5.5’s 5.7% and Claude