Claude Opus 4.8
Flagshipby Anthropic
Claude Opus 4.8 was Anthropic's flagship from May 28, 2026 until Claude Opus 5 succeeded it on July 24, arriving itself just six weeks after Opus 4.7. Anthropic describes it as a more effective collaborator with sharper judgement, more honesty about its own progress, and the ability to work independently for longer. Agentic coding climbs from 64.3% to 69.2% and knowledge work from 1753 to 1890 on Anthropic's own measures, at API pricing of $5 input and $25 output per million tokens, unchanged from Opus 4.7 and 4.6 and held again by Opus 5. The new fast mode is roughly 2.5x quicker and about three times cheaper than before, and it bills at $10 and $50 across the full context window. It keeps the 1 million token context window and adds Dynamic Workflows for large-scale parallel subagent tasks.
Input Price
$5.00
per 1M tokens
Output Price
$25.00
per 1M tokens
Context Window
1M
tokens
Released
2026-05
API access
Capabilities
Key Strengths
- ✓1M token context window
- ✓Priced at $5/$25 per 1M tokens, the same rate as Opus 4.7, 4.6, and Opus 5
- ✓Agentic coding up to 69.2%
- ✓Fast mode 2.5x faster and 3x cheaper, billed at $10/$50
- ✓Dynamic Workflows for parallel subagents
Best For
- ▸Whole-repository refactors
- ▸Long-running asynchronous agent workflows
- ▸Multi-document research synthesis
- ▸Extended codebase debugging
Benchmark Scores
| Benchmark | Score | Description |
|---|---|---|
| SWE-bench | 88.6 | Real-world software engineering tasks from GitHub issues (SWE-bench Verified) |
| GPQA Diamond | 93.6 | Graduate-level science questions verified by domain experts |
| OSWorld 2.0 | 55.7 | Computer use across real desktop applications and multi-step GUI tasks |
| BrowseComp | 84.3 | Agentic web search and browsing over hard-to-find facts |
| FrontierCode v1.1 | 46.5 | Agentic coding on frontier software engineering tasks (Main split) |
| Terminal-Bench 4.0 | 16.2 | Long-horizon agentic work in a terminal across software, science, ML, operations, hardware, security, and media (66 tasks, all-or-nothing verifiers) |
| Humanity's Last Exam (tools) | 57.9 | Multidisciplinary expert-level reasoning with tool access |
Scores sourced from public benchmark datasets. See full benchmark leaderboard for all models.
Pricing Details
Input tokens
$5.00
per 1M tokens
Output tokens
$25.00
per 1M tokens
Estimated cost per 1K requests
$17.50
~1K input + ~500 output tokens avg
Prices are subject to change. Check the official documentation for current pricing. See the cost calculator for detailed estimates.
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