The frontier ceiling — same model as Fable 5, safeguards lifted, partner-only.
100
Coding
97
Writing
99
Research
87
Images
12
Value
98
Long Context
Published benchmarks
95.5%
SWE-bench
1,932
Arena Elo
94.2%
MMLU
83.5%
GPQA
97.4%
MATH
Use this when
Frontier cybersecurity research, autonomous vulnerability discovery, and the absolute capability ceiling
Skip this if
You don't have vetted-partner access or don't need lifted safeguards — Fable 5 is the same model, generally available, at the same price.
Pricing
$10.00/1M in
$50.00/1M out
→0%since Jun 2026
Context
1M tokens
Speed
Deliberate
Launched June 9, 2026 alongside Fable 5, following the April Project Glasswing private preview on Google Cloud. Restricted to vetted enterprise and research partners due to advanced cybersecurity capabilities. Same underlying model and benchmarks as Claude Fable 5.
80.3% SWE-Bench Pro — tied with Fable 5 as the highest public coding score of any model
Safeguards lifted in some areas for advanced security and research workloads
Excels at complex, multi-step cybersecurity tasks under partner access
Same 1M-token context and 1932 GDPval-AA score as Fable 5
Weaknesses
Not generally available — limited to vetted partners after Project Glasswing's private preview
Most teams should use Fable 5, which is the same model with standard safeguards
Premium $10/$50 pricing and a deliberate, high-latency profile
Real-world use cases
What people actually use Claude Mythos 5 for.
Multi-step cybersecurity workflows: vulnerability discovery, exploit reasoning, and containment analysis
High-stakes autonomous engineering where the safety-tuned Fable 5 is too constrained
Frontier research programs running under Anthropic's vetted-partner access controls
How Claude Mythos 5 compares
The nearest models people weigh against it, and what actually separates them.
vs Claude 3.5 Sonnet — Against Claude 3.5 Sonnet (Anthropic), Claude Mythos 5 costs about 40% more per token, takes 5x the context and answers slower. Claude 3.5 Sonnet is the one to check first if the price difference matters more than the ceiling.
vs Claude 3.7 Sonnet (thinking) — Against Claude 3.7 Sonnet (thinking) (Anthropic), Claude Mythos 5 costs about 70% more per token and takes 5x the context. Claude 3.7 Sonnet (thinking) is the one to check first if the price difference matters more than the ceiling.
vs Claude Fable 5 — Against Claude Fable 5 (Anthropic), Claude Mythos 5 lands within a few percent on price. Which one wins depends on whether context depth or latency is your constraint.
Price History
Claude Mythos 5 pricing over time
→0% since Jun 11
79 data points · tracked daily since Jun 11, 2026
Ready to try it?
Start using Claude Mythos 5
Frontier cybersecurity research, autonomous vulnerability discovery, and the absolute capability ceiling. Start free — no card required.
Claude 3.5 Sonnet is Anthropic's mid-cycle flagship model, balancing strong reasoning, coding, and instruction-following with a 200K context window. It sits between Haiku and Opus in Anthropic's lineup, offering near-flagship quality at a lower cost than top-tier models.
Verdict
One of the best models for coding and complex instruction-following, but its premium pricing demands premium use cases.
Quality score
81%
Pricing
$6.00/1M in
$30.00/1M out
Speed
Balanced
3/5 speed
Context
200k tokens
Pricing at $6 input / $30 output per million tokens is significantly higher than GPT-4o ($2.50/$10). Best accessed via Anthropic API or Amazon Bedrock. Claude 3.5 Sonnet (October 2024 version) supersedes the June 2024 release with improved performance.
Claude 3.7 Sonnet with extended thinking enabled — Anthropic's hybrid reasoning model that explicitly deliberates before responding, surfacing its chain-of-thought for complex multi-step problems. It sits between standard Sonnet and full reasoning-only models, balancing depth with practical usability.
Verdict
The most transparent reasoning model on the market — ideal when you need to see and trust the thought process, not just the answer.
Quality score
73%
Pricing
$3.00/1M in
$15.00/1M out
Speed
Deliberate
2/5 speed
Context
200k tokens
Thinking tokens (the internal reasoning trace) count toward output token billing, which can significantly increase costs on complex queries. The thinking budget can often be configured via the API. Best used selectively for tasks that genuinely benefit from deliberation rather than as a default model.
ReasoningExtended ThinkingCodingAgenticAnthropic
Best for
Tackling complex coding challenges, mathematical proofs, and multi-step logical problems where visible reasoning and higher accuracy matter more than speed.
Anthropic's new Mythos-class flagship and the most capable coding model anyone can use — 80.3% SWE-Bench Pro, an 11-point jump over Opus 4.8. 1M context, 128K output, native parallel subagents. Released June 9, 2026.
Verdict
New global #1 — 80.3% SWE-Bench Pro, the most capable model generally available.
Quality score
98%
Pricing
$10.00/1M in
$50.00/1M out
Speed
Deliberate
2/5 speed
Context
1M tokens
Launched June 9, 2026 as the public, Mythos-class release. Available on the Claude API, Microsoft Foundry, and Google Vertex AI. Free for all users until June 22, 2026. Same underlying model as Claude Mythos 5, with safeguards that block specific high-risk cyber responses.
Coding leaderSWE-Bench Pro #1Mythos-classParallel subagentsAgenticLong contextPremiumNew
Best for
The hardest coding tasks, autonomous multi-step agents, and frontier-grade reasoning
Claude Mythos 5 costs $10 per million input tokens and $50 per million output tokens on the API. A month of 10M input and 2M output tokens runs about $200.00 at list price, before any batch or caching discounts.
What is Claude Mythos 5 best for?
Claude Mythos 5 is best for frontier cybersecurity research, autonomous vulnerability discovery, and the absolute capability ceiling. It is a strong fit when that workflow matters more than the tradeoffs around premium pricing and deliberate speed.
When should I avoid Claude Mythos 5?
You don't have vetted-partner access or don't need lifted safeguards — Fable 5 is the same model, generally available, at the same price.
What is a cheaper alternative to Claude Mythos 5?
Claude 3.7 Sonnet (thinking) (Anthropic) at $3.00/1M/1M input against Claude Mythos 5's $10.00/1M/1M — roughly 70% less per token all in. The most transparent reasoning model on the market — ideal when you need to see and trust the thought process, not just the answer. Compare it first if Claude Mythos 5's pricing is the thing stopping you.
What is a faster alternative to Claude Mythos 5?
Claude 3.5 Sonnet — balanced against Claude Mythos 5's deliberate, with 200k tokens of context. Worth the swap when response time is what your users notice rather than the last few points of reasoning depth.
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