MYTHOS-CLASSGENERAL APITEXT + VISIONSAFEGUARDEDPROMPT CACHING
Claude Fable 5 API Pricing
Claude Fable 5 is Anthropic's generally available flagship Mythos-class model. The launch post lists $10/M input and $50/M output; the API alias is claude-fable-5. Anthropic describes long-context work across millions of tokens but has not published an exact context limit.
Input - per 1M tokens
$10.00/M
Source Anthropic launch launch
Output - per 1M tokens
$50.00/M
Model ID claude-fable-5 launch
Cached input - derived 90% off
$1.00/M
Cache standard Claude multiplier -90%
Effective - agentic blend
$6.41/M
92/8 split - 82% cache
§ 01 / TERMINAL
Run the numbers.
Live calculator pre-loaded with Claude Fable 5 launch pricing. Cache-hit input is derived from Anthropic's standard 0.1x prompt-caching multiplier because Fable 5 is not yet itemized in the main pricing table.
$ /mo
Workload split
Prompt cache hit rate
Tokens you can process
—
Words equivalent (English)
—
Effective rate
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§ 02 / SCENARIOS
Real-world presets.
MYTHOS-CLASS CODING
Codebase-scale migration
$0.814/task
LONG DOC ANALYSIS
Multi-document deal review
$0.872/doc
VISION AGENT
Screenshot-to-app rebuild
$0.318/task
RESEARCH TURN
Scientific hypothesis pass
$0.215/turn
§ 03 / TAPE
Price history.
Input · $10/M
Output · $50/M
Cached · $1/M
JUN 09 Claude Fable 5 launched at $10/M input and $50/M outputJUN 09 Anthropic pricing/docs verified $10/$50 pricing, $1 cache hits, 1M context, and 128K max output
§ 04 / TOKENIZER
Paste text. See tokens. See cost.
Estimate · anthropic-bpe-estimate · ≈2.6 chars/token Auto-counts as you type
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
Characters 516
Words 77
Tokens (estimated) 198 tokens
Cost as input · uncached $0.001980 USD
Cost as output · uncached $0.009900 USD
Cost as cached input $0.000198 USD
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Claude Fable 5 Current | $10.00 cache $1.00 | $50.00 | $6.41 agentic 92/8 | 1M | Generally available flagship agents |
| Claude Mythos 5 | $10.00 cache $1.00 | $50.00 | $13.20 restricted access | 1M | Trusted cyber / bio access |
| Claude Opus 4.8 | $5.00 cache $0.50 | $25.00 | $3.21 fallback model | 1M | Sensitive fallback and Opus workloads |
| Claude Sonnet 4.6 | $3.00 cache $0.30 | $15.00 | $1.92 cheaper sibling | 1M | Production agents and coding |
| Claude Haiku 4.5 | $1.00 cache $0.10 | $5.00 | $0.64 cheap high-volume tier | 200K | Support and classification |
| GPT-5.5 | $5.00 cache $0.50 | $30.00 | $3.61 frontier competitor | 1M | OpenAI frontier agents |
| Gemini 3.5 Flash | $1.50 cache $0.15 | $9.00 | $1.08 budget multimodal competitor | 1M | Google multimodal agents |
| DeepSeek V4 Pro | $0.43 cache $0.00 | $0.87 | $0.14 budget reasoning competitor | 1M | Low-cost reasoning workloads |
Frequently asked.
Practical Claude Fable 5 pricing questions, including the launch price, safeguards, API alias, and what is not yet itemized in the main pricing docs.
Q · 01 What is Claude Fable 5 priced at? +
Anthropic's launch post lists Claude Fable 5 at
$10/M input and $50/M output. AI//COST derives $1/M cache-hit input from Anthropic's standard 0.1x prompt-caching multiplier, because Fable 5 is not yet itemized in the main pricing table at time of publication.Q · 02 What API model ID should developers use? +
Yes. Anthropic lists
claude-fable-5 as the Claude API ID for Fable 5.Q · 03 How is Fable 5 different from Mythos 5? +
Anthropic says Fable 5 and Mythos 5 are the same underlying model. Fable 5 is the generally available version with safeguards; Mythos 5 has safeguards lifted in some areas and is restricted to Glasswing partners / trusted access.
Q · 04 What happens when a safeguard triggers? +
Anthropic says some cybersecurity, biology/chemistry, and distillation-related requests are handled by Claude Opus 4.8 instead. The company says this fallback triggers in less than 5% of sessions on average.
Q · 05 Is Fable 5 included in subscriptions? +
Anthropic says Fable 5 is included on Pro, Max, Team, and seat-based Enterprise plans from June 9 through June 22, 2026. Starting June 23, use on those plans requires usage credits unless Anthropic extends the included window.
Q · 06 Does the main pricing docs table include Fable 5 yet? +
Not when verified on June 9, 2026. The launch post is the official pricing source for this page; the pricing docs still listed Opus, Sonnet, and Haiku rows.
Q · 07 Does Fable 5 support vision? +
Yes. Anthropic describes Fable 5 as state of the art for vision tasks and says it can rebuild web app source code from screenshots.
Q · 08 Is Fable 5 cheaper than Claude Mythos Preview? +
Yes. The launch post says Fable 5 and Mythos 5 are offered at
$10/$50, less than half the $25/$125 Mythos Preview rate captured in the archive page.