Model by Anthropic

Claude Opus 4.8

Claude Opus 4.8 is the older Opus that many agent setups still run on, and it suits teams that have not yet moved to the 5 series.

Checked 2026-11-05

Claude Opus 4.8 is the older Opus that many agent setups still run on, and it suits teams that have not yet moved to the 5 series. Anthropic released it on 28 May 2026, while OpenRouter shows 27 May. It holds 1 million tokens of context, up to 128 thousand tokens of output, with a reliable knowledge cutoff of January 2026. Price is $5 per million input tokens and $25 per million output tokens. At launch Anthropic's fast mode cost $10 and $50. The model defaults to high effort, with extra and max selectable. Anthropic called the gain over Opus 4.7 modest but tangible, and said it is about four times less likely to let flaws in its own code pass unremarked. It is now a legacy model, and retirement is not sooner than 28 May 2027. The API id is claude-opus-4-8. It is also the model Anthropic falls back to when Opus 5 safeguards flag a request in Claude Code. We would keep it for pinned workflows and move new work to Opus 5.5, which costs less at $4 and $20. Figures come from Anthropic's announcement, its model page and OpenRouter. We have not run it ourselves.

Mentioned here

Questions

What is the context window of Claude Opus 4.8?

1,000,000 tokens, with up to 128,000 tokens of output.

How much does Claude Opus 4.8 cost?

$5 per million input tokens and $25 per million output tokens, checked 31 October 2026.

Can I run Claude Opus 4.8 on my own hardware?

No. The weights are not published, so you use it through the maker's API or a hosting provider.

Who makes Claude Opus 4.8?

Anthropic makes it, and released it on 27 May 2026.

Reviews

Loading reviews…

Write a review

Your rating

Up to 1000 characters. Stars alone are enough.

Where you can run it

Compare hosts

  • OpenRouter

    OpenRouter routes more than 600 models through one API key.

    • Model gateway (router)
    • OpenAI compatible

Similar

  • Claude Haiku 4.5

    Claude Haiku 4.5 is Anthropic's small, fast model from late 2025, still available but now legacy, so it suits only pipelines already built around it.

    • Closed

    Anthropic, 200K context, $1 in / 1M

  • Claude Opus 4.7

    Claude Opus 4.7 is Anthropic's April 2026 top-tier model for long-running agents, and it is now a legacy model: Anthropic points users to Opus 5.5.

    • Closed

    Anthropic, 1M context, $5 in / 1M

  • Claude Sonnet 4.6

    Claude Sonnet 4.6 is Anthropic's mid-priced model for everyday coding and agent work, and it is now a legacy model, so new projects should look at Sonnet 5.5 first.

    • Closed

    Anthropic, 1M context, $3 in / 1M

  • Claude Sonnet 5

    Claude Sonnet 5 is Anthropic's mid-tier model for agentic coding at a low price, and it fits developers who want near-Opus results without Opus bills.

    • Closed

    Anthropic, 1M context, $2 in / 1M