Anthropic declines to submit Mythos 5.1 to UK AISI, raising protectionism fears
According to the Financial Times, Anthropic declined to submit its Mythos 5.1 model to the UK AI Safety Institute (AISI) for pre-release testing. The decision has prompted fears within the British government that US AI labs are aligning with US protectionism.
Coverage timeline
Techmeme
Financial Times : Sources: Anthropic declined to submit Mythos 5.1 to the UK AISI for pre-release testing, prompting UK fears that US AI labs are aligning with US protectionism — Decision to exclude Aisi has prompted fears inside British government of protectionist shift among tech groups.

Related stories
White House asks OpenAI, Anthropic to delay UK AISI model access; Anthropic reportedly agrees
Politico reports that the White House has asked OpenAI and Anthropic not to share new AI models with the UK's AI Safety Institute (AISI) until US reviews are completed. Anthropic appears to have agreed to this request, while OpenAI's response is not specified.
1 reports · 1 sources
UK AISI staff signed off with stress amid tight AI model schedules
According to the Financial Times, multiple staff at the UK's AI Safety Institute (AISI) have been signed off work with stress, as tight model release schedules and concerns about AI lead to low morale and burnout. Top researchers at AISI, OpenAI, Anthropic, and Google DeepMind report burnout and stress from developing powerful AI.
1 reports · 1 sources
Anthropic grants ENISA testing access to Mythos 5; Mythos 5.1 still withheld
Bloomberg reports that Anthropic has granted the EU cybersecurity agency ENISA testing access to its Mythos 5 model, following months of negotiations that began in late May. However, ENISA still lacks access to the newer Mythos 5.1 version.
1 reports · 1 sources
Anthropic risk report raises misalignment risk to low, details stronger internal Model 2
Anthropic's second Risk Report, dated August 2026 and totaling 186 pages, raises its misalignment risk estimate from very low to low and states it does not plan to release an internal model called Model 2. The report describes Model 2 as a Mythos-class model that is slightly stronger overall than Claude Mythos 5 in some areas, already used extensively internally for coding, data generation, and agent tasks, but lacking full external evaluation and public release plans.
2 reports · 2 sources

News updates every hour. Subscribe in your RSS reader to get new stories automatically.
Subscribe