RESTRICTED ACCESSMYTHOS-CLASSGLASSWINGTEXT + VISIONNO PUBLIC SIGN-UP
Claude Mythos 5 API Pricing
Claude Mythos 5 is Anthropic's restricted-access Mythos-class flagship: the same underlying model as Claude Fable 5, with safeguards lifted in some areas for approved cyberdefenders and infrastructure partners. Anthropic lists $10/M input and $50/M output, but has not published a self-serve API alias or exact context limit.
Restricted input - per 1M tokens
$10.00/M
Source Anthropic launch restricted
Restricted output - per 1M tokens
$50.00/M
Access Glasswing / trusted restricted
Cached input - per 1M tokens
$1.00/M
Prompt cache hit price -90%
Effective - agentic blend
$6.41/M
92/8 split - 82% cache
§ 01 / TERMINAL
Run the numbers.
Restricted-access calculator pre-loaded with the Claude Mythos 5 launch price. Because Anthropic has not published a public cache or API alias row for Mythos 5, this calculator uses the $10/$50 token prices without a cache discount.
$ /mo
Workload split
Prompt cache hit rate
Tokens you can process
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Words equivalent (English)
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Effective rate
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§ 02 / SCENARIOS
Real-world presets.
CYBER DEFENSE
Vulnerability triage pass
$0.001/task
INFRASTRUCTURE
Large-codebase security review
$0.001/review
LIFE SCIENCES
Protein-design tool run
$0.001/run
RESEARCH
Novel hypothesis work session
$0.000/session
§ 03 / TAPE
Price history.
Input · $10/M
Output · $50/M
Cached · $1/M
JUN 09 Claude Mythos 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 452
Words 65
Tokens (estimated) 174 tokens
Cost as input · uncached $0.001740 USD
Cost as output · uncached $0.008700 USD
Cost as cached input $0.000174 USD
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Claude Mythos 5 Current | $10.00 cache $1.00 | $50.00 | $6.41 restricted cache blend | 1M | Approved cyber / bio trusted access |
| Claude Fable 5 | $10.00 cache $1.00 | $50.00 | $6.41 general release with safeguards | 1M | Generally available flagship usage |
| Claude Mythos Preview | $25.00 | $125 | $33.00 older restricted preview | documented elsewhere | Historical restricted preview |
| Claude Opus 4.8 | $5.00 cache $0.50 | $25.00 | $3.21 fallback / public Opus | 1M | Public frontier fallback |
| Claude Sonnet 4.6 | $3.00 cache $0.30 | $15.00 | $1.92 production sibling | 1M | Production agents and coding |
| 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 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 Mythos 5 pricing questions, with access limits separated from Fable 5 general availability.
Q · 01 What is Claude Mythos 5 priced at? +
Anthropic's launch post lists Claude Mythos 5 at
$10/M input and $50/M output, the same list price as Claude Fable 5 and less than half of the earlier Mythos Preview rate.Q · 02 Can anyone use Mythos 5? +
No. Anthropic says Claude Mythos 5 is restricted to current Glasswing partners until a trusted access program is available. It is not a general self-serve API model.
Q · 03 What is the API model ID for Mythos 5? +
Yes. Anthropic's models overview lists
claude-mythos-5, but access is limited through Project Glasswing rather than general self-serve availability.Q · 04 How is Mythos 5 different from Fable 5? +
Anthropic says Mythos 5 is the same underlying model as Fable 5, but with safeguards lifted in some areas for approved users. Fable 5 is the generally available version with safeguards and Opus 4.8 fallback.
Q · 05 What kinds of users get Mythos 5 access? +
Anthropic says current Mythos Preview / Project Glasswing users can upgrade first, and it plans broader trusted access for cybersecurity organizations plus a biology trusted-access program.
Q · 06 Does Mythos 5 have prompt-caching pricing? +
The launch post only publishes
$10/M input and $50/M output. This page uses no cache discount until Anthropic publishes a Mythos 5 cache row or confirms the exact billing behavior for restricted access.Q · 07 Is Mythos 5 replacing Mythos Preview? +
For existing Glasswing partners, yes in practice: Anthropic says users with Mythos Preview access will be able to upgrade to Mythos 5.
Q · 08 Should general developers use Mythos 5 or Fable 5? +
General developers should use
claude-fable-5. Mythos 5 is restricted; Fable 5 is the generally available model with safeguards.