Claude Opus 4.8
FrontierAnthropic•Released on 2026-05-28
Anthropic's most capable generally available model, released May 28, 2026 — weeks after Opus 4.7. Anthropic describes it as having sharper judgement, more honesty about its own progress, and the ability to work independently for longer. It is roughly 4x less likely than Opus 4.7 to miss flaws in code it produces and less prone to unsupported claims. Same pricing as Opus 4.7 makes it a drop-in upgrade, and a new Fast Mode runs the same model at higher speed.
Voice of the community
sample 40“Claude Opus 4.8 has sharper judgement, more honesty about its progress, and the ability to work independently for longer than its predecessors.”
“Opus 4.8 is roughly four times less likely than Opus 4.7 to miss flaws in code it produces, and Anthropic calls it its 'most honest' model yet.”
“Opus 4.8 beats Opus 4.7 and GPT-5.5 on many benchmarks, leading agentic coding on SWE-Bench Pro at 69.2%.”
Core Specs
Scenario Scores
Pros & Cons
Pros
- +Leads agentic coding (SWE-Bench Pro 69.2 vs 4.7's 64.3, GPT-5.5 58.6)
- +~4x less likely to miss flaws in its own code
- +Best-in-class multidisciplinary reasoning (Humanity's Last Exam)
- +Same price as Opus 4.7 (drop-in upgrade)
- +1M context window + new Fast Mode for higher speed
Cons
- −Still 2x the price of comparable GPT-5.5 tiers
- −Launch benchmarks are Anthropic-reported, pending independent verification
- −Fast Mode costs 2x the standard per-token price