Claude Opus 4.8
Anthropic
Key facts · verified Oct 29, 2026
Claude Opus 4.8 is an Anthropic model released on 28 May 2026. Its API price is $5 per million input tokens and $25 per million output tokens. Its context window is 1M tokens. It ranks #41 on LMArena's text leaderboard (Elo 1474, read 3 Nov 2026). Source: platform.claude.com.
Claude Opus 4.8 is an Anthropic model released on May 28, 2026, with a 1M-token context window and pricing of $5 per million input tokens and $25 per million output tokens. Anthropic lists it as a legacy model that remains available and suggests migrating to Claude Opus 5.5.
Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1474 Elo (rank 41) · source · retrieved Nov 3, 2026
Key Features
Agentic Coding Adaptive Thinking Vision Long Context Tool Use 128k Max Output
Full Specifications
$5 / $25 per million tokens | |
|---|---|
| Identity | |
| Developer | Anthropic |
| Released | May 2026 |
| Status | Available (legacy) |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $10.000 / 1M tokens |
| Input price | $5.000 / 1M tokens |
| Output price | $25.000 / 1M tokens |
| Cached input | $0.50 / 1M tokens (cache hit) |
| Batch discount | 50% off input/output (Batch API) |
| Free tier | Small trial credit for new accounts, no ongoing free tier |
| Capacity | |
| Context window | 1M tokens |
| Max output | 128k tokens |
| Long-context surcharge | None (full 1M window at standard pricing) |
| Capability | |
| Vision in | Yes |
| Audio in | No |
| Function calling | Yes |
| Structured output | Yes |
| Extended reasoning | No (adaptive thinking) |
| Web search | Yes |
| Code execution | Yes |
| Access | |
| API | Yes |
| Chat app | Yes |
| Cloud marketplaces | AWS Bedrock, Google Cloud, Microsoft Foundry |
| Fine-tuning | No |
| Measured quality | |
| LMArena Elo | 1474 (checked Nov 2026) |
| LMArena rank | Rank 41 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 147 |