Plain-English Summary
Anthropic’s strongest broadly available model for advanced coding, agents, computer use, and complex professional work.
Claude Opus 4.8
Anthropic’s strongest broadly available model for advanced coding, agents, computer use, and complex professional work.
Claude 4
Reasoning LLM
GA
Open weights: No
API: Yes
Technical Notes
Multimodal model with adaptive reasoning, 1M context, 128K output, computer-use and tool-calling support.
Best For
Advanced software engineering, browser agents, research, high-stakes analysis
Watch Out For
Higher cost and latency than Sonnet or Haiku.
Model Specs
- Maker
- Anthropic
- Country
- USA
- Family
- Claude 4
- Type
- Reasoning LLM
- Release date
- 2026-05-28
- Date confidence
- Exact
- Status
- GA
- Context window
- 1,000,000 tokens
- Max output
- 128,000
- Parameters
- Not disclosed
- Active parameters
- Not disclosed
- Architecture
- Proprietary multimodal transformer
- Reasoning
- Yes — adaptive
- Tool calling
- Yes
- Structured output
- Yes
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $5 input / $25 output per 1M tokens
- How to access
- Provider website or API
- Model / API ID
- claude-opus-4-8
- Knowledge cutoff
- 2026-01
- Fine-tuning
- Prompting / RAG
- Completeness
- 90 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source