Anthropic just introduced Claude Fable 5 and Claude Mythos 5 🚀
The interesting part:
Fable 5 and Mythos 5 are basically the same underlying model, but with different access and safety layers.
✅ Claude Fable 5 is the version available for general users. Anthropic says it is their most capable generally available model so far, especially for:
• Software Engineering
• Long-running agentic tasks
• Vision-based work
• Knowledge work
• Scientific reasoning
• Long-context workflows
One example they shared is pretty wild:
Stripe tested it on a 50M-line Ruby codebase, and it completed a migration in one day that would normally take a team more than two months. 🤯
But because the model is much stronger, Anthropic is adding stricter safeguards.
For risky areas like cybersecurity, biology/chemistry, and model distillation, some requests will automatically fall back to Claude Opus 4.8 instead of Fable 5. ⚠️
Claude Mythos 5 is the restricted version, mainly for trusted Cyber defenders, infrastructure providers, and later selected biology researchers. It has some safeguards lifted depending on the access program.
Pricing is 💸:
• $10 / 1M input tokens
• $50 / 1M output tokens
[ Read More ] : https://www.anthropic.com/news/claude-fable-5-mythos-5
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#AI #Claude #LLM
@ProgrammingTip
The interesting part:
Fable 5 and Mythos 5 are basically the same underlying model, but with different access and safety layers.
✅ Claude Fable 5 is the version available for general users. Anthropic says it is their most capable generally available model so far, especially for:
• Software Engineering
• Long-running agentic tasks
• Vision-based work
• Knowledge work
• Scientific reasoning
• Long-context workflows
One example they shared is pretty wild:
Stripe tested it on a 50M-line Ruby codebase, and it completed a migration in one day that would normally take a team more than two months. 🤯
But because the model is much stronger, Anthropic is adding stricter safeguards.
For risky areas like cybersecurity, biology/chemistry, and model distillation, some requests will automatically fall back to Claude Opus 4.8 instead of Fable 5. ⚠️
Claude Mythos 5 is the restricted version, mainly for trusted Cyber defenders, infrastructure providers, and later selected biology researchers. It has some safeguards lifted depending on the access program.
Pricing is 💸:
• $10 / 1M input tokens
• $50 / 1M output tokens
[ Read More ] : https://www.anthropic.com/news/claude-fable-5-mythos-5
〰️〰️〰️〰️〰️〰️
#AI #Claude #LLM
@ProgrammingTip
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Claude Opus 5.5 is now on the Claude Platform 🚀
Anthropic introduced Claude Opus 5.5, a lower-cost frontier model available in Claude Code and through the Claude Platform.
That matters if your agent workload has been split between a high-end model for hard tasks and cheaper models for everything else. A lower-cost Opus tier can change where that handoff happens.
What to check:
• Run your existing eval set, not a few cherry-picked prompts.
• Measure tool-call accuracy and recovery after a failed call.
• Compare total agent cost: tokens, retries, and human review time.
For Claude Code users, model choice is now a practical repo-level config decision, not just a benchmark chart.
[ Blog ] :
https://www.anthropic.com/claude-opus-5-5
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#AI #LLM #Claude #ClaudeCode
@ProgrammingTip
Anthropic introduced Claude Opus 5.5, a lower-cost frontier model available in Claude Code and through the Claude Platform.
That matters if your agent workload has been split between a high-end model for hard tasks and cheaper models for everything else. A lower-cost Opus tier can change where that handoff happens.
What to check:
• Run your existing eval set, not a few cherry-picked prompts.
• Measure tool-call accuracy and recovery after a failed call.
• Compare total agent cost: tokens, retries, and human review time.
For Claude Code users, model choice is now a practical repo-level config decision, not just a benchmark chart.
[ Blog ] :
https://www.anthropic.com/claude-opus-5-5
〰〰〰〰〰〰
#AI #LLM #Claude #ClaudeCode
@ProgrammingTip
Anthropic
Introducing Claude Opus 5.5
Claude Opus 5.5 leads in agentic coding and knowledge work, and costs 40% less to run than Opus 5 on typical workloads.
Claude Opus 5.5 is available in the API 🚀
Anthropic released Claude Opus 5.5, and it is available through the Claude API.
The practical pitch is simple: lower typical token costs than Opus 5, plus a faster mode when response time matters more than squeezing out the last bit of reasoning.
What to check in your evals:
• Run the same tool-use and coding tasks against Opus 5.
• Measure latency separately for normal and faster mode.
• Track input and output tokens, not just the model's listed price.
A cheaper high-end model changes agent architecture decisions. Some workflows that needed routing to a smaller model may now fit under one stronger default.
[ Read More ] :
https://www.anthropic.com/claude/opus
〰〰〰〰〰〰
#AI #LLM #Claude #API
@ProgrammingTip
Anthropic released Claude Opus 5.5, and it is available through the Claude API.
The practical pitch is simple: lower typical token costs than Opus 5, plus a faster mode when response time matters more than squeezing out the last bit of reasoning.
What to check in your evals:
• Run the same tool-use and coding tasks against Opus 5.
• Measure latency separately for normal and faster mode.
• Track input and output tokens, not just the model's listed price.
A cheaper high-end model changes agent architecture decisions. Some workflows that needed routing to a smaller model may now fit under one stronger default.
[ Read More ] :
https://www.anthropic.com/claude/opus
〰〰〰〰〰〰
#AI #LLM #Claude #API
@ProgrammingTip
Anthropic
Claude Opus
Hybrid reasoning model built for serious coding and AI agents, featuring a 1M context window.
Claude Sonnet 5.5 is built for coding agents 🚀
Anthropic released Claude Sonnet 5.5 for the Claude Platform. It targets the work developers actually hand to coding agents: navigating a repo, making changes across files, using tools, and checking the result.
What changed:
• Faster agentic work: aimed at shorter tool loops and less idle time while an agent investigates a codebase.
• Lower-cost option: positioned for teams that need to run coding tasks repeatedly, not just ask one-off questions.
• Production focus: Anthropic calls out software engineering and multi-step agent workflows directly.
If your agent spends more time calling tools than writing code, model latency and per-task cost matter as much as benchmark scores. Test it on a real issue queue, with your actual tool permissions.
[ Read More ] :
https://www.anthropic.com/claude-sonnet-5-5
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#AI #LLM #Claude #CodingAgents
@ProgrammingTip
Anthropic released Claude Sonnet 5.5 for the Claude Platform. It targets the work developers actually hand to coding agents: navigating a repo, making changes across files, using tools, and checking the result.
What changed:
• Faster agentic work: aimed at shorter tool loops and less idle time while an agent investigates a codebase.
• Lower-cost option: positioned for teams that need to run coding tasks repeatedly, not just ask one-off questions.
• Production focus: Anthropic calls out software engineering and multi-step agent workflows directly.
If your agent spends more time calling tools than writing code, model latency and per-task cost matter as much as benchmark scores. Test it on a real issue queue, with your actual tool permissions.
[ Read More ] :
https://www.anthropic.com/claude-sonnet-5-5
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#AI #LLM #Claude #CodingAgents
@ProgrammingTip
Anthropic
Introducing Claude Sonnet 5.5
Claude Sonnet 5.5 is a clear upgrade over Claude Sonnet 5, runs 30%+ faster, and costs up to 30% less for most work.
Claude Haiku 5.5 is available on the Claude Platform 🚀
Anthropic released Claude Haiku 5.5, its lower-cost small model, on the Claude Platform.
The model ID is
What to test first:
• Replace your fast-path model in staging.
• Measure tool-call accuracy, not just chat quality.
• Set a harder-model fallback for failed evaluations.
Small models pay off when they handle the boring 80 percent cleanly. Keep the expensive model for the weird tickets.
[ Read More ] :
https://www.anthropic.com/claude-haiku-5-5
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#AI #LLM #Claude #API
@ProgrammingTip
Anthropic released Claude Haiku 5.5, its lower-cost small model, on the Claude Platform.
The model ID is
claude-haiku-5-5. This is the one to benchmark when your workload has lots of short agent turns: classification, extraction, routing, simple tool calls, and coding tasks where latency matters more than maximum reasoning depth.What to test first:
• Replace your fast-path model in staging.
• Measure tool-call accuracy, not just chat quality.
• Set a harder-model fallback for failed evaluations.
Small models pay off when they handle the boring 80 percent cleanly. Keep the expensive model for the weird tickets.
[ Read More ] :
https://www.anthropic.com/claude-haiku-5-5
〰〰〰〰〰〰
#AI #LLM #Claude #API
@ProgrammingTip
Anthropic
Introducing Claude Haiku 5.5
Claude Haiku 5.5 is our fastest, most capable small model. Built for high-volume work like summarization, subagents, and browser use.