Home/Models/Claude Mythos 5
AnthropicLimited availabilityChecked 2026-07-14

Claude Mythos 5 pricing, context window, and cost calculator

Anthropic's limited-availability Project Glasswing model with the same published specifications and pricing as Claude Fable 5, without Fable's safety classifiers.

Estimate this model's costCompare with another modelView provider pricingOfficial source ↗
Verified fields

Quick facts

ProviderAnthropic
API model IDclaude-mythos-5
Default input / 1M$10.00
Default output / 1M$50.00
Context window1,000,000
Default profilestandard
Acceptstext, image
Producestext
Knowledge cutoff2026-01
StatusLimited availability
AccessInvitation-only access for approved Project Glasswing customers; there is no self-serve sign-up.
Maximum output128,000 tokens

Supported capabilities

  • Streaming
  • Function calling
  • Prompt caching
  • Batch API
  • Reasoning
  • Code execution

Only capabilities explicitly tracked from provider documentation are shown.

Source-tracked rates

Verified pricing profiles

Amounts are USD per 1M tokens unless the column states an hourly storage unit.

ProfileInput / 1MCached input / 1MCache write / 1MOutput / 1MNotes
standardDefault$10.00 USD$1.00 USD$12.50 USD (5m) / $20.00 USD (1h)$50.00 USDUsed for default estimates.
batch$5.00 USD——$25.00 USDTracked separately; select explicitly when modeling this profile.
Workload estimate

Claude Mythos 5 cost calculator

Change the workload assumptions. The calculator uses the same shared pricing resolver as StackLens Compare.

Estimated monthly total$350.00
Monthly input cost
$100.00
Monthly output cost
$250.00
Per 1,000 requests
$35.00
Active profile
standard

Estimate excludes untracked provider-specific charges.

Explicit assumptions

Common workload examples

Input only

1M input tokens

$10.00 under the standard profile, excluding output and other charges.

Output only

1M output tokens

$50.00 under the standard profile, excluding input and other charges.

Default workload

10,000 monthly requests

At 1,000 input and 500 output tokens per request: $350.00 under standard.

Cache scenario

50% cached input

The same default workload with 50% cached input is estimated at $305.00. Cache savings apply only to the tracked cached-input rate.

Tracked relationships

Related models

Same providerClaude Fable 5AnthropicLower tracked input priceClaude Opus 4.8AnthropicLower tracked input priceClaude Sonnet 5AnthropicLower tracked input pricegpt-5.6-solOpenAI
Verification

Sources and methodology

Pricing and limits are source-tracked and may change. Verify current values with the provider before making production purchasing decisions.

Calculator profile rule: standard is the verified default. Claude Mythos 5 is the limited-availability successor to Claude Mythos Preview. Anthropic documents always-on adaptive thinking and invitation-only Project Glasswing access.