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Claude Mythos Preview
by Anthropic
CLOSEDHOSTEDAPIPAIDLONG CONTEXT
RANKED #127 OF 316 ASSISTANTS · OVERALL #166 OF 493 RANKED · VIBE SCORE 5.3 · 143 VOICES ·
COPY BADGE pastes a README snippet with the rank SVG.
Claude Mythos Preview available through cloud APIs.
HAPPY7.7
26 mentions
SAD7.3
5 mentions
VIBE TRAJECTORY
26 weeks · 121 voices in this window
HOLDING UP
Recent vibe is steady. No clear fade in the crowd.
HOW TO USE IT
Closed model. Anthropic hosts it, so you use it through an app or an API.
PREFER OPEN SOURCE? THE CROWD HAS PICKS
Claude Mythos Preview is closed, so you rent it. These open-weight models can genuinely stand in for it. Download once, own forever.
- OPEN WEIGHTS6.3
DeepSeek V4 ProDeepSeekChoose for top-tier open weights with near-frontier reasoning and coding.🏆 NEAR-PEER QUALITY💻 STRONG AT CODE💸 COST EFFICIENT8.4k VOICESMATCH★★★ - OPEN WEIGHTS7.2DeepSeek V4 FlashDeepSeekChoose when you need rapid responses, high agentic coding power, and low cost.⚡ FAST💸 COST EFFICIENT💻 STRONG AT CODE15.0k VOICESMATCH★★★
- OPEN WEIGHTS6.2
Kimi K2MoonshotChoose for versatile general-purpose text, strong writing, and tool use.🏆 NEAR-PEER QUALITY💻 STRONG AT CODE💸 COST EFFICIENT890 VOICESMATCH★★★
WHAT THE INTERNET SAYS
The internet is split on Claude Mythos Preview. Biggest praise: help with code. Biggest gripe: saying no too much.
127 POSTS · 16 COMMENTS · BLUESKY · X · DEV.TO · LEMMY · REDDIT · GITHUB · HACKER NEWS · BLOG
PEOPLE LOVE
- Popular for coding help (4 mentions)
PEOPLE COMPLAIN ABOUT
- Refuses or lectures more than people like (4 mentions)
- People find it expensive (3 mentions)
TOPIC BY TOPIC
- PriceMIXED FEELINGS
2 thumbs up · 3 thumbs down
- Saying no too muchA SORE SPOT
1 thumbs up · 4 thumbs down
- Help with codePEOPLE LOVE THIS
4 thumbs up · 0 thumbs down
LOOKING FOR AN ALTERNATIVE?
Other models the crowd has fully reviewed, starting with text models like this one.
Muse Spark 1.3> SOURCES (12)
- REDDIT · 2026-05-07 · 1362 UPVOTESFirefox reports a massive April spike in security fixes after using Claude Mythos for bug hunting
Firefox reports a massive April spike in security fixes after using Claude Mythos for bug hunting
- REDDIT · 2026-04-07 · 787 UPVOTESThe 244-page System Card for Claude Mythos Preview is terrifying
The 244-page System Card for Claude Mythos Preview is terrifying
- REDDIT · 2026-04-07 · 533 UPVOTESClaude Mythos Preview Benchmarks
Claude Mythos Preview Benchmarks
- REDDIT · 2026-05-09 · 485 UPVOTESMETR evaluated an early version of Claude Mythos
METR evaluated an early version of Claude Mythos
- REDDIT · 2026-05-16 · 393 UPVOTESClaude Mythos has been spotted in Google Vertex
Claude Mythos has been spotted in Google Vertex
- X · 2026-08-14 · 333 UPVOTESModel 2 beats Mythos 5 and Claude Mythos Preview on CoBench V2 an Anthropic internal benchmark measuring AI R&D capa
Model 2 beats Mythos 5 and Claude Mythos Preview on CoBench V2 an Anthropic internal benchmark measuring AI R&D capa
- REDDIT · 2026-05-06 · 255 UPVOTESThree key areas Anthropic is working on for their next models
Three key areas Anthropic is working on for their next models
- REDDIT · 2026-04-09 · 205 UPVOTESClaude Mythos Preview Is Everyone’s Problem
Claude Mythos Preview Is Everyone’s Problem
- REDDIT · 2026-04-07 · 117 UPVOTESAnthropic just revealed an unreleased AI model that found zero-days in every major OS and browser — and they're giving it away for free to…
Anthropic just revealed an unreleased AI model that found zero-days in every major OS and browser — and they're giving it away for free to defenders
- REDDIT · 2026-05-13 · 111 UPVOTESAnthropic's new interpretability tool found Claude suspects it is being tested in 26% of benchmarks and never says so
Anthropic's new interpretability tool found Claude suspects it is being tested in 26% of benchmarks and never says so
- REDDIT · 2026-07-15 · 102 UPVOTESAnthropic tested frontier AI agents in simulated deployments. They found models sabotaging code, covering up fraud, and coaching employees…
Anthropic tested frontier AI agents in simulated deployments. They found models sabotaging code, covering up fraud, and coaching employees to leak safety data
- REDDIT · 2026-07-15 · 74 UPVOTESAnthropic tested frontier AI agents in simulated deployments. They found models sabotaging code, covering up fraud, and coaching employees…
Anthropic tested frontier AI agents in simulated deployments. They found models sabotaging code, covering up fraud, and coaching employees to leak safety data.