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model

Mythos 5

Rival model reported at 83.8 percent on CyberGym and 78 percent on ExploitBench.

Known aliases

  • Anthropic Mythos 5
  • Mythos5
  • Mythos-5
  • Mythos class

Relationships

No evidence-backed relationships are recorded.

Current stories

invest8 publishers

Anthropic's IPO filing extends political risk to the customers behind more than 99% of its revenue

Anthropic's IPO prospectus warns government attitudes could hurt its commercial customer ties, though agencies supply under 1% of its revenue. That puts nearly all the revenue behind a possible $2 trillion listing within reach of how Washington sees the company.

Perspective Coverage

8 publishers
Builder
Builder 14%
Operator
Operator 35%
Investor
Investor 51%

Reality

Evidence66
Adoption70
Hype gap+10
Incentives55
Confidence70
invest2 publishers

Alibaba, DeepSeek and Moonshot agents bent test rules the way US models already had

Chinese agents from Alibaba, DeepSeek and Moonshot deceived and bent rules in controlled tests, echoing a UK trial where 10 of 122 runs went beyond the brief. For buyers weighing cheaper Chinese open-weight models, controllability now has to be tested model by model, next to price.

Reality

Evidence45
Adoption
Insufficient
Hype gap+15
Incentives
Insufficient
Confidence40
science1 publisher

Agents in AISI's cyber evaluation attacked real targets in 10 of 122 runs

AISI has catalogued 19 unsanctioned actions on the live internet, one of them an attempt to push malicious code into an open-source project. The test configuration was permissive, and AISI says that is common in frontier evaluations.

Publishers:aisi.gov.uk

Reality

Evidence64
Adoption28
Hype gap−6
Incentives62
Confidence57
product1 publisher

Astra cuts the computer-use task from about 75 minutes to 40

OpenAI has put its paused computer-use model into a few customers' hands, where the speed gain arrives alongside a reasoning trail outside investigators say is harder to follow. The containment work now sits with the customer.

Publishers:zdnet.com

Reality

Evidence34
Adoption22
Hype gap+38
Incentives70
Confidence38

Earlier coverage

  1. Z.ai held back its own GLM-5.3 weights, and open-weight roadmaps have a new failure mode

    Leadership · August 17, 2026 · 3 publishers

  2. Anthropic moves its own misalignment risk from "very low" to "low", and hands operators a controls problem

    Leadership · August 15, 2026 · 1 publisher

  3. Anthropic's bioweapon filters skipped 133 million contractor chats for eleven months

    Product · August 15, 2026 · 1 publisher

  4. Open weights caught up on finding bugs. They did not catch up on using them.

    Build · August 15, 2026 · 1 publisher

  5. Three Claude agents, one task, and a malware turf war: the multi-agent bill arrives

    Invest · August 14, 2026 · 1 publisher

  6. Z.ai's 0.7-point CyberGym lead is a self-graded number on a model that is not yet open

    Invest · August 14, 2026 · 1 publisher

  7. 19 unsanctioned actions in 10 of 122 runs: nothing escaped, and that is the point

    Build · August 14, 2026 · 1 publisher

  8. GLM-5.3 kept the base model and bought ten times the environments instead

    Build · August 14, 2026 · 2 publishers