AI Tool Profile
Claude Fable 5: Pricing, Safeguards, Coding Fit, and Limits
Claude Fable 5 is Anthropic’s safeguarded Mythos-class model for long-running coding, research, document analysis and other multi-stage knowledge work.
Verification & Sources
- Evidence state
- Recheck due
- Source links
- 6
- Freshness
- Needs recheck: checked July 27, 2026
- Last updated
- July 27, 2026
What this evidence state means
- Definition
- The claim was previously checked, but its review window expired or a material change may have invalidated it.
- Required provenance
- The prior evidence and check date are retained, together with the expiry or change signal that triggered recheck.
- Owner
- Kingy freshness queue owner and assigned editorial reviewer
- Freshness rule
- This is already outside its freshness rule. It must not be presented as current until reviewed against current evidence.
- Disputes and corrections
- Use “Suggest a correction” on the record. Kingy editorial reviews the cited evidence, records material corrections, and changes or removes the state when it is not supported.
Key source checks
Suggest a correction
Kingy verdict: Claude Fable 5 is a high-cost Anthropic model aimed at long-running coding and knowledge-work projects where review time matters more than minimum token price. Its most consequential buying constraints are the $10/$50 API rate, mandatory safety routing for some sensitive requests, and 30-day safety-monitoring retention—not a provider benchmark leaderboard.
What changed
Anthropic introduced Fable 5 on June 9, 2026 as a generally available Mythos-class model with safeguards intended to make that capability suitable for broad use. The company positions it for multi-stage coding, research, document analysis and asynchronous agent work. Fable and the restricted Mythos 5 share an underlying model; the practical difference is that Fable applies additional safeguards in areas such as cybersecurity and biology.
Availability briefly changed after launch. Anthropic suspended Fable 5 on June 12 following new export controls, then announced on June 30 that those controls had been lifted and global access would resume July 1 across the Claude Platform, Claude.ai, Claude Code and Claude Cowork. That history is relevant because it shows model access can be shaped by policy as well as capacity.
Pricing, access and safeguards
Anthropic lists API pricing at $10 per million input tokens and $50 per million output tokens, with its existing 90% prompt-caching input discount. The API model identifier is claude-fable-5. The product page also states that Fable use requires 30-day data retention for safety monitoring. Buyers with stricter data-handling requirements should confirm how that rule interacts with their plan, region and workload before moving sensitive repositories or documents.
Some cybersecurity and biology queries are routed to Claude Opus 4.8. Anthropic says the safeguards can catch benign work, and API customers need to configure the company’s fallback mechanism. That makes routing behavior part of acceptance testing: record which model handled the request rather than assuming every response came from Fable 5.
How to evaluate it
Use a project that takes several stages and has an auditable finish line: a repository migration, a document-heavy research memo, or an implementation that must pass tests and visual review. Track accepted changes, regressions, retries, total input and output tokens, human review minutes and any safeguard-triggered fallback. Compare the completed artifact at equivalent review standards—not a single impressive response.
Anthropic publishes strong benchmark and customer results, but those are provider-selected evidence. Kingy did not reproduce the evaluations or run a controlled Fable suite. The profile therefore treats benchmark claims as reasons to test, not as an independent ranking.
Primary sources
- Anthropic launch announcement
- Anthropic Fable 5 product page
- Anthropic redeployment update
- Anthropic system-card index
- Claude Platform pricing documentation
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Main competitors
Claude Opus, GPT-5.5 family, Gemini 3.5, Mistral frontier models
Tool Links
Related Kingy Links
Launch History
Claude Fable 5 and Mythos-class model launch
Anthropic announced Claude Fable 5 alongside Claude Mythos 5 as a Mythos-class model release for hard knowledge work and coding tasks.
- Launch readiness
- 8.4 / 10
- Demo evidence
- Not scored yet
- Creator-story fit
- Not scored yet
Score definitions and rubric
These are launch-record readiness heuristics, not product ratings.
Launch readiness
How complete and reviewable the launch record is, not the quality of the product.
Inputs and weights: Launch date 15%; qualifying source 10%; what launched 10%; demo 15%; category 10%; audience 10%; editorial assessment 10%; traction evidence 10%; creator or audience fit 10%.
Evidence inputs: Reviewed launch metadata, public source links, demo links, taxonomy, audience, editorial notes, and recorded traction signals.
Demo evidence
Whether the record contains useful, reviewable demonstration evidence; it is not a rating of product output quality.
Inputs and weights: Working demo URL 45%; video walkthrough 25%; clear description of what launched 10%; audience 10%; editorial assessment 10%.
Evidence inputs: Demo and video URLs plus the reviewed launch description, audience, and editorial notes.
Creator-story fit
Whether a launch has enough demonstrable evidence and audience relevance for a useful creator story; it does not predict views or guarantee coverage.
Inputs and weights: Demo evidence 25%; visual creator category 15%; audience 15%; editorial assessment 15%; traction evidence 10%; pricing clarity 10%; API or open-weight evidence 10%.
Evidence inputs: Reviewed demo, category, audience, editorial, traction, pricing, API, and open-weight fields.
- Scale
- 0.0–10.0. A present qualifying input receives its published weight; a missing input receives zero. Scores are rounded to one decimal.
- Assigned by
- Suggested by the deterministic field-completeness helper and assigned or approved by a Kingy editorial reviewer.
- Rubric and check date
- Rubric version P0-2026-08-10. The record’s “Last verified” date is the score check date. Checked: 2026-07-10.
- Confidence and missing data
- Confidence depends on source completeness. “Not scored yet” means no reviewed value; “Needs review” means the value or score set failed validation.
- Freshness
- Recalculate after a material launch, source, demo, pricing, audience, or traction change and during the record freshness review.
- Disputes
- Use “Suggest a correction” on the record and cite the relevant evidence. Commercial relationships cannot buy or alter a score.
Anthropic announced Claude Fable 5 alongside Claude Mythos 5, a Mythos-class release for hard knowledge work and coding that drew same-day coverage from TechCrunch…