Claude Mythos 5
$5,226.00 / month- Input cost
- $1,476.00
- Output cost
- $3,750.00
- Per 1,000 calls
- $174.20
- Pricing profile
- standard
Source-tracked model comparison
Claude Mythos 5 vs Sonnet 5: how do access and agent-loop cost change the decision?
Compare verified pricing and model limits for limited-access versus generally available Claude agent tiers. The cost example uses a ai agent loops workload and does not assume equal model quality.
Direct cost answer: Claude Mythos 5 is estimated at $5,226.00 per month and Claude Sonnet 5 at $1,045.20 for 6,000 input tokens, 2,500 output tokens, and 30,000 monthly requests. Claude Sonnet 5 is $4,180.80 lower under these assumptions. This does not identify a quality winner.
Tracked facts
Pricing and model limits
Prices are USD per 1M tokens under each model's verified default profile.
| Field | Claude Mythos 5 | Claude Sonnet 5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| API model ID | claude-mythos-5 | claude-sonnet-5 |
| Input / 1M | $10.00 | $2.00 |
| Cached input / 1M | $1.00 | $0.20 |
| Output / 1M | $50.00 | $10.00 |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Maximum output | 128,000 tokens | 128,000 tokens |
| Accepted input | text, image | text, image |
Example workload
AI agent loops cost scenario
6,000 input and 2,500 output tokens per request, 30,000 monthly requests, and 20% cached input.
Claude Sonnet 5
$1,045.20 / month- Input cost
- $295.20
- Output cost
- $750.00
- Per 1,000 calls
- $34.84
- Pricing profile
- standard
Cost result: Claude Sonnet 5 is $4,180.80 lower per month for these assumptions. This is a price comparison, not a model-quality ranking.
Questions to answer before choosing
- Is Mythos access available to the intended team?
- Which agent tasks justify testing the limited-access model?
- How many calls and retries complete a representative task?
What this estimate leaves out
Treat monthly requests as model calls, not user tasks. Tool execution and external API charges are excluded.
Latency, reliability, output quality, retries, regional processing, and provider-specific tool charges can change the practical decision.