OpenAIAnthropicGooglexAIPerplexity
← Back to all updatesPublished ·Anthropic• Minor
Anthropic launched Claude Fable 5 and Claude Mythos 5 with 1M context and 128k max output.
The read
Default million-token context and always-on adaptive thinking make long-context behavior a baseline for these Claude models.
The frame
Fable is widely released, Mythos is limited to Project Glasswing, so builders have different availability paths for the same context profile.
Primary source
Anthropic →Keep reading
See what Nova3 builds →Related updates
- Jul 26, 2026OpenAI updated GPT-5.5 Instant to improve conversational quality in decision, advice, planning, research, and shopping tasks.
- Jul 25, 2026Enterprise and Edu users can find skills under Plugins, on the Skills tab in the Plugin Directory.
- Jul 25, 2026Anthropic removed modelcard language for Claude Fable 5 and Claude Mythos 5.
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