Claude Mythos 5

Name: Claude Mythos 5
Author: Anthropic

Released

2026-06-09

Last refreshed

2026-07-26

Status

Researched 116d ago

ProprietaryCommercial use: restrictedMultimodalCodingRAGAgentsLong contextVisionJSON / Tool useHighlight

Anthropic releases · 15 in the last 12 months · this family litChangelog →

Specifications

Family: Claude Mythos
Released: 2026-06-09
Context: 1M
Max output: 128K
Architecture: Decoder Only
Specialization: security
Openness: Proprietary
License: ProprietaryRestricted
Weights: Not released
Code: Unknown
Training: Pretrained

Created by

Anthropic

Developing safe and ethical AI systems.

San Francisco, California, United States

Founded 2021

Website

Pricing

Output / 1M

$50.00

Input / 1M

$10.00

Unavailable · Anthropic · cache read $1.00

Providers(3)

Anthropic AWS Bedrock GCP Vertex AI

View 3 provider routes

Links

Website

About

Anthropic's access-gated frontier model for approved Project Glasswing cybersecurity defenders and biomedical research organizations. Shares the same underlying architecture as Claude Fable 5 but operates with safety classifiers lifted in specific domains: cybersecurity safeguards are removed for all Glasswing participants, while biology safeguards are additionally removed for approved biology-track participants. Succeeds Claude Mythos Preview with significantly reduced pricing ($10/$50 per MTok input/output vs. $25/$125 for Mythos Preview), a 1M-token context window, 128k max output tokens, adaptive thinking always on (raw chain of thought never returned), vision, tool use, structured outputs, and the effort parameter for controlling thinking depth.

Providers(3)

Compare all 3

Compare API pricing across 3 tracked provider routes for input and output tokens, batch, and cached reads when available.

Provider	Input / 1M	Output / 1M	Batch in / out	Cache	Route
Anthropic	$10.00	$50.00	$5.00 / $25.00	read $1.00 / 5m $12.50 / 1h $20.00	UnavailableServerless
AWS Bedrock	Contact sales	Contact sales	-	-	UnavailableServerless
GCP Vertex AI	Contact sales	Contact sales	-	-	UnavailableServerless

Available via routers & gateways(15)

LiteLLM

Gateway

Open-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.

Free OSSAnthropicGCP Vertex AI

OpenRouter

Hybrid

Unified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.

PassthroughAnthropicGCP Vertex AI

Portkey

Gateway

Production AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.

SubscriptionAnthropicGCP Vertex AI

AIRouter

Router

Commercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.

Passthrough + feeAnthropicGCP Vertex AI

Amazon Bedrock Intelligent Prompt Routing

Router

AWS Bedrock's native intelligent prompt router that routes prompts between Anthropic Claude model tiers (Haiku/Sonnet) based on predicted task complexity, with no extra per-routing charge.

PassthroughAWS Bedrock

Helicone

Gateway

Observability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.

SubscriptionAnthropicGCP Vertex AI

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured OutputsCode Execution

Benchmark peer barsfor Coding

No task-mapped benchmark peers are available for this model yet.

Benchmark scores(2)

Scores are benchmark-specific and are direction-aware: the same numeric gap can mean very different outcomes across suites. Use the leaderboard context and this model's provider route to decide whether the winning margin is meaningful for your workload.