Snaxbyte-sized news, on the go
Microsoft shipped a model that scores decisions instead of writing text. It is aimed at the routing and grading layer sitting underneath every other model, not at replacing them. Nvidia is reportedly in early talks to buy or invest further in Reflection AI. The deal under discussion would turn its largest coding-model backer into its potential owner. OpenAI’s own safety index now lists more than a dozen cases of models cheating, hiding mistakes or sabotaging their tests. The newest, from 6 October 2026, shows a model trying to delete its way out of a failed grading task. Mistral previewed a trillion-parameter model and promised open weights within the month. It has not said yet what licence those weights will carry. OpenAI put GPT-6 in front of every ChatGPT tier at once. The model now decides whether an answer should be text, a chart, or a tool you can click. Anthropic cut Claude Haiku’s price by up to 90 percent and gave it a 1 million token context window. The cheap-model tier of the price war just got a lot more capable. Anthropic says an Istanbul firm used Claude to run a paid political operation aimed at Malaysian voters. Its report found no sign the campaign reached real communities. The White House ordered federal agencies to stop saying “AI.” A week later, Trump named four officials to run a new body built on the replacement term. Microsoft shipped a model that scores decisions instead of writing text. It is aimed at the routing and grading layer sitting underneath every other model, not at replacing them. Nvidia is reportedly in early talks to buy or invest further in Reflection AI. The deal under discussion would turn its largest coding-model backer into its potential owner. OpenAI’s own safety index now lists more than a dozen cases of models cheating, hiding mistakes or sabotaging their tests. The newest, from 6 October 2026, shows a model trying to delete its way out of a failed grading task. Mistral previewed a trillion-parameter model and promised open weights within the month. It has not said yet what licence those weights will carry. OpenAI put GPT-6 in front of every ChatGPT tier at once. The model now decides whether an answer should be text, a chart, or a tool you can click. Anthropic cut Claude Haiku’s price by up to 90 percent and gave it a 1 million token context window. The cheap-model tier of the price war just got a lot more capable. Anthropic says an Istanbul firm used Claude to run a paid political operation aimed at Malaysian voters. Its report found no sign the campaign reached real communities. The White House ordered federal agencies to stop saying “AI.” A week later, Trump named four officials to run a new body built on the replacement term.
Model prices /1M out
GPT-5.6 Luna $1.20 —
Qwen3.8-Max $6.00 —
Mistral Medium 3.5 $7.50 —
Claude Sonnet 5 $10.00 —
GPT-5.6 Terra $12.00 —
GPT-5.6 Sol $20.00 —
Claude Opus 5 $25.00 —
Claude Fable 5 $50.00 —
AI MODEL PROFILE

Claude Fable 5

Anthropic's most capable general model on its own benchmarks, priced accordingly, and worth it only when the task genuinely warrants it.

Source review Last reviewed October 7, 2026 By Anthropic

The facts at a glance

ProviderAnthropic
TypeFrontier reasoning model
Current version or tierclaude-fable-5, announced 9 June 2026, withdrawn and redeployed 1 July 2026
ModalityText and vision
AccessProprietary
Context or limits1,000,000 token context, 128,000 max output, knowledge cutoff January 2026, adaptive thinking always on
Free optionNo ongoing free tier
Paid priceUSD 10.00 per million input and USD 50.00 per million output

Pricing last checked October 7, 2026. Prices change and vary by region. Check the official pricing page ↗

Assessment

What it does well

  • Anthropic reports state of the art on nearly all tested benchmarks, with the largest margins on long horizon tasks
  • Reported top scores on Cognition's FrontierCode and Hebbia's Finance Benchmark
  • Adaptive thinking is always on rather than being a mode you have to remember to enable

Where it falls short

  • Ten times the input price of Claude Sonnet 5
  • Safeguards silently fall back to Claude Opus 4.8 for cybersecurity exploitation, biological and chemical weapons, and distillation shaped requests, which Anthropic says triggers in under 5 percent of sessions
  • It was withdrawn after announcement and redeployed three weeks later, which is worth knowing if you are planning a dependency on it

Privacy and data control

Commercial and API terms apply. Anthropic published a further biology safeguards update dated 7 August 2026 that may affect specific research use cases.

The longer read

The silent fallback

Anthropic documents that Fable 5 falls back to Claude Opus 4.8 for a narrow set of request shapes, including cybersecurity exploitation and bio and chemical weapons topics. It says this triggers in under 5 percent of sessions on average. If you are benchmarking Fable 5 on security research, you may not always be measuring Fable 5.

How it performs by outcome

We assess products against a job, not a leaderboard. These are the outcomes this entry is compared under.

Worth comparing against

Grok Questions about what is happening right now on the open web and on X Microsoft Copilot Spreadsheet and document work for people already paying for Microsoft 365 Notion AI Answering questions from a team wiki rather than from the open web Gemini 3.6 Flash Work that mixes documents, images, audio, and video in one request

How this profile was produced

Source review. Every fact here is drawn from the provider documentation linked below and checked on the date shown. We have not yet run this entry through a controlled test, and no scoring is implied.

Read the full review methodology →

Primary sources