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Claude Opus 5.5: Specs, Benchmarks, Pricing and How It Stacks Up Against GPT-6 Astra ...
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Fusion42 · 23 September 2026 · Fusion42 review
Anthropic released Claude Opus 5.5 on September 22, 2026, as a flagship AI model boasting 20% lower pricing than its predecessor Opus 5 and competitive performance against GPT-6 Astra on key benchmarks. It introduces a 1M-token context window, image input capability, and breaking API changes impacting developers, while promising faster output and reduced operational costs.
This Wire brief sits within Fusion42's coverage of AI Frontier Models, and 2 sources have reported it.
◆ ◆ The Wire takeaway
Anthropic has cut Claude's running costs by 20% with Opus 5.5, forcing you to rethink your AI cost structure this week if price or token efficiency affects your product. Its new API breaking changes demand urgent code updates to maintain compatibility.
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2 sources · 23 Sep 2026
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