Anthropic · llm model
Claude Opus 4.8
Claude Opus 4.8 is an Anthropic language model released May 28, 2026; Anthropic's newest language model in our dataset is Claude Haiku 5.5. Proprietary, API access only. Anthropic's Claude Opus 4.8, launched May 28, 2026 with a 1M-token context by default and 128k max output. Verified against vendor sources on Oct 26, 2026.
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- ReleasedMay 28, 2026
- Context window1M1,000,000 tokens
- Max output128K128,000 tokens
- LicenceProprietaryProprietary (API)
Modalities not verified
Key facts
| Fact | Value | Source |
|---|---|---|
| Vendor | Anthropic | n/a |
| Released | May 28, 2026 Date of the launch entry in the Claude Platform release notes (API availability). | source |
| Status | generally available | n/a |
| API id | claude-opus-4-8 | source |
| Context window | 1,000,000 tokens (1M) | source |
| Max output | 128,000 tokens | source |
| Licence | Proprietary (API) | source |
| Pricing | $5 in / $25 out per 1M tokens | source |
Where Claude Opus 4.8 sits in our data
- Released May 28, 2026 (week 22 of 2026), in May 2026. Other models in our data released that month: Nano Banana Pro, Command A+, Grok Build 0.1, Gemini 3.1 Flash-Lite.
- The previous Anthropic model we track is Claude Opus 4.7 (Apr 16, 2026), 42 days earlier.
- Of the 60 models in our data with a published context window, Claude Opus 4.8 has the number 37 largest (1M tokens). Our data is not every model on the market.
- Anthropic tools we cover: Claude Code, Claude.
- All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.
How Claude Opus 4.8 differs from Claude Opus 4.7
Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.
- Listed price is the same as Claude Opus 4.7: $5 in and $25 out (per 1M tokens).
- Claude Opus 4.8 lists a 1M-token context window; we have none recorded for Claude Opus 4.7.
- Claude Opus 4.8 came out 42 days after Claude Opus 4.7.
- Facts for the other model: Claude Opus 4.7.
What we tested
Nothing yet. We have not run Claude Opus 4.8 ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.
Not verified, left out
We could not confirm these on a vendor page, so we do not state them.
- Price is stated in the Claude Opus 5 release note ("the same pricing as Claude Opus 4.8").
Sources
More from Anthropic
- Claude Opus 4.7 (Apr 16, 2026)
- Claude Fable 5 (Jun 9, 2026)
- Claude Mythos 5 (Jun 9, 2026)
- Claude Sonnet 5 (Jun 30, 2026)
- Claude Opus 5 (Jul 24, 2026)
- Claude Mythos 5.1 (Sep 1, 2026)
- Claude Sonnet 4.6 (Feb 17, 2026)