ClaudeDevs says Opus 5.5 is the first Opus with Fable 5.1-class safeguards

CClaudeDevs9/22/2026, 09:50:21

ClaudeDevs says Opus 5.5 is the first Opus with Fable 5.1-class safeguards on cyber, bio, and frontier LLM development.

Flagged requests fall back to another model. ClaudeDevs says it is working to reduce incorrect flags.

#opus-5.5 #fable-5.1 #safeguards #claudedevs

Previous articleOpus 5.5 is available in Claude Code and the Claude Platform Next articleClaude introduces Opus 5.5 and says it costs 40% less to run than Opus 5

Related AI news

ClaudeDevs outlines Claude Code cloud sessions and releases workflow field guide

ClaudeDevs explained that Claude Code cloud sessions run on a fresh VM for each task, allowing users to start several tasks at once that continue running after closing their laptop. The team also published a field guide detailing seven suitable workflows and initial GitHub setup.

CClaudeDevs•10/6/2026, 12:06:07•

#claude-code #claudedevs #github

ClaudeDevs publishes a guide for building with Claude Sonnet 5.5

ClaudeDevs says Claude Sonnet 5.5 is out and has published a guide for building with it, covering model choice against Opus 5.5, migration from Sonnet 5, and use in Claude Code.

CClaudeDevs•9/28/2026, 14:51:07•

#claude-sonnet-5.5 #claude-code #claude-opus-5.5 #developer-guide

ClaudeDevs says Opus 5.5 is 20% cheaper per token and 60% cheaper on cache reads

ClaudeDevs says Opus 5.5 costs 20% less per input and output token than Opus 5, and 60% less on cache reads. It also published a calculator for estimating Claude Code task cost from /usage.

CClaudeDevs•9/25/2026, 11:15:59•

#opus-5.5 #pricing #claude-code #claude

Opus 5.5 is available in Claude Code and the Claude Platform

ClaudeDevs says Opus 5.5 is available in Claude Code and the Claude Platform, and is using it as the new daily driver for coding and agentic work, citing its intelligence, lower price, and speed.

CClaudeDevs•9/22/2026, 09:55:22•

#opus-5.5 #claude-code #claude-platform #model-release

Claude introduces Opus 5.5 and says it costs 40% less to run than Opus 5

Opus 5.5 is the first model in the Claude 5.5 family. Claude says it matches Claude Fable 5.1 on most tasks, while ClaudeDevs says it is about 30% faster and about 40% cheaper per task than Opus 5, alongside higher Claude Code session limits.

CClaudeDevs•9/22/2026, 09:56:55•

#claude #opus-5.5 #claude-code #pricing

Reset history AI News FAQ Usage limits RSS feeds API MCP Skill

News is compiled from public information. The data is for reference only, and this site has no affiliation with OpenAI.

Data & original project: Did Codex Reset · Licoy