Anthropic and OpenAI are both launching new model updates today, with Claude Opus 5.5 and GPT-6 Sol & Luna both being announced within roughly an hour of each other.
Claude Opus 5.5 was up to bat first today, so we’ll start there.
Anthropic explains that its latest model update performs at the level of Claude Fable 5.1 on “most work” while cutting costs to run by around 40% compared to Opus 5 – which was already around half the price of Fable 5.
Opus 5.5 requires less compute to serve than Opus 5, and its pricing reflects that. Our tests show that at default settings it will cost 40% less than Opus 5 on typical workloads. Input and output tokens are $4 and $20 per million, 20% less than Opus 5. Cache reads (which make up the majority of agentic and coding work costs) are $0.20 per million tokens, 60% less than Opus 5. Opus 5.5 also generates output more than 30% faster than Opus 5.
Despite the lower compute costs, Anthropic says that Opus 5.5 is more powerful, beating out Fable 5.1 in every metric and beating OpenAI’s GPT-6 Astra in virtually every category measured as well including metrics such as agentic coding, knowledge work, and more.
And that’s not all. OpenAI, roughly an hour after Claude’s announcement, launched its GPT-6 Sol & Luna models, also focused on costs.
6 counterparts. Specifically, they’re both about 50% less expensive when measuring input and output per 1 million tokens in API use.
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