Anthropic cuts API costs with Opus 5 as rivals unite to defend open weights

Short summary

Anthropic launched Claude Opus 5 at half the cost of its predecessor, topping coding leaderboards but alienating power users with opaque safety downgrades. Microsoft, Meta, and Nvidia formed a 20-company coalition lobbying to protect open-weight ecosystems, while OpenAI and Anthropic abstained. Chinese model Kimi K3 demonstrated autonomous zero-day exploitation capabilities validated by US and UK safety institutes, raising urgent security concerns.

• •Claude Opus 5 launches at $5/$25 per million tokens, matching or beating flagship models on coding benchmarks
• •20-company coalition lobbies for open weights; OpenAI and Anthropic conspicuously absent
• •Kimi K3 autonomously exploited a Redis zero-day using 64 sub-agents, confirmed by international safety institutes

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