Claude Opus 4.8
Anthropic's premier frontier model, optimized for advanced coding, autonomous agentic loops, and deep reasoning with a massive 1M-token context.
Overview
What is Claude Opus 4.8
Claude Opus 4.8 is Anthropic's flagship multimodal reasoning model, released on May 28, 2026. Built for complex agentic workflows, advanced software engineering, and deep document analysis, it introduces 'dynamic workflows' and a massive 1-million-token context window, delivering state-of-the-art honesty and code precision.
Running it privately on Venice
On Venice, you can access Claude Opus 4.8 with zero prompt retention. While served via an anonymized third-party pipeline where Venice forwards requests without personal identifiers, it provides a private alternative to standard Big Tech surveillance. You gain access to elite reasoning, vision, and web search without building a permanent digital dossier.
Assessment
Strengths and limitations
- Elite coding performance, scoring 69.2% on SWE-Bench Pro, outperforming GPT-5.5.
- Highly reliable agentic execution with 'dynamic workflows' for complex, multi-step tasks.
- Exceptional honesty and calibration, with a 4x reduction in allowing code flaws to pass unremarked compared to Opus 4.7.
- Massive 1,000K (1M) token context window allowing entire codebases or multi-hundred-page PDFs to be analyzed at once.
- Native support for vision, web search, and structured JSON outputs.
- Closed-source and proprietary, lacking the sovereignty of true open-source weights.
- High inference cost ($6/$30 per 1M tokens) compared to highly capable open-weights models like DeepSeek V3.2.
- Served via third-party API routing, meaning Venice must forward anonymized requests rather than running it on zero-retention local hardware.
Capabilities
What it supports
- Tool use / function calling
- Vision (image input)
- Reasoning
- Web search
- Code-optimized
- Structured output (JSON schema)
- Audio input
- Video input
- Multiple image inputs
- Log probabilities
Variants
Claude Opus 4.8 serving tiers
Claude Opus 4.8 runs on Venice in 2 serving tiers: the same model at different speeds and prices. Pick by latency needs; each tier is its own model id on the API.
| Tier | What it is | Price / 1M tokens | Context | Model ID |
|---|---|---|---|---|
| Standardflagship | Full-quality serving at standard pricing | $6 in · $30 out | 1,000K tokens | claude-opus-4-8 |
| Fast | The same model served with faster output | $12 in · $60 out | 1,000K tokens | claude-opus-4-8-fast |
Pricing and context come straight from the Venice model API and refresh with every catalog ingest. The specs and pricing on this page are for the standard tier; pass the model id of the tier you want to the API.
Claude Opus 4.8 Standard
Full-quality serving at standard pricing. $6 in · $30 out per 1M tokens, 1,000K tokens context.
claude-opus-4-8Claude Opus 4.8 Fast
The same model served with faster output. $12 in · $60 out per 1M tokens, 1,000K tokens context.
claude-opus-4-8-fastSpecifications
Datasheet
- Maker
- Anthropic
- Released
- May 28, 2026
- Architecture
- Dense Transformer (Proprietary)
- Modality
- Text, Image, PDF (Multimodal)
- Open weights
- No — proprietary
- Context window
- 1,000K tokens
- Max output
- 128K tokens
- Capabilities
- Vision, Function calling, Reasoning, Web search, Code-optimized
- Privacy on Venice
- Anonymized — prompts not stored
- Available on Venice since
- May 2026
API
Call it from your code
Venice exposes an OpenAI-compatible API. Point your base URL at Venice and pass the model id.
curl https://api.venice.ai/api/v1/chat/completions \
-H "Authorization: Bearer $VENICE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-opus-4-8",
"messages": [{ "role": "user", "content": "Explain quantum tunneling simply." }]
}'Pricing
What it costs on Venice
Billed per token on Venice: $6 per 1M input tokens and $30 per 1M output tokens.
New Venice accounts include a free daily allowance and 500 welcome credits — no credit card required.
Alternatives
How it compares
| Model | Best for | Context window | SWE-Bench Pro | Open weights | Price (Venice) |
|---|---|---|---|---|---|
| Claude Opus 4.8 | The premier agentic and coding model of the Claude 4 lineup. | 1M tokens | 69.2% | No | $6 in · $30 out / 1M |
| Claude Opus 4.7 | Predecessor model; slightly less calibrated and slower. | 1M tokens | Unverified | No | $6 in · $30 out / 1M |
| Claude Sonnet 4.6 | The balanced speed-to-cost alternative for high-volume tasks. | 1M tokens | Unverified | No | $3.60 in · $18 out / 1M |
| DeepSeek V3.2 | Incredibly cheap, open-weights alternative for sovereign hosting. | 160K tokens | Unverified | Yes | $0.33 in · $0.48 out / 1M |
The premier agentic and coding model of the Claude 4 lineup.
Use cases
What it is good for
- 01Autonomous software engineering and multi-file code refactoring via Claude Code.
- 02Deep analysis of massive financial reports, legal documents, or academic papers.
- 03Complex multi-step agentic workflows requiring tool use and web search.
- 04Visual analysis of complex diagrams, charts, and user interfaces.
Prompting
Getting better results
Provide full context: take advantage of the 1M context window by uploading entire codebases or reference documents.
Use structured XML tags to organize your prompts, which Claude models are natively optimized to parse.
Ask the model to think step-by-step or outline its plan before generating complex code to leverage its reasoning capabilities.
Version history
First major Opus 4 release.
Stronger coding and vision.
Current flagship with dynamic workflows.
FAQ
Frequently asked questions
Claude Opus 4.8 is Anthropic's flagship multimodal AI model, released on May 28, 2026. It is optimized for complex coding, agentic tasks, and long-context reasoning.
On Venice, Claude Opus 4.8 is priced at $6.00 per 1 million input tokens and $30.00 per 1 million output tokens, with cached inputs billed at $0.60 per 1 million tokens.
No, Claude Opus 4.8 is a proprietary, closed-weights model developed by Anthropic. However, Venice users can access it with private, anonymized routing.
Yes, Claude Opus 4.8 natively supports vision (image and PDF input), tool use/function calling, web search, and structured JSON outputs.
Venice forwards your prompts to a third-party provider using anonymized routing. No personal identifiers or prompt histories are stored by Venice, though the third-party provider may retain data per their policies.
Claude Opus 4.8 leads on coding benchmarks (69.2% on SWE-Bench Pro vs 58.6% for GPT-5.5) and long-context retrieval, while GPT-5.5 excels in terminal-centric workflows.
Claude Opus 4.8 features a massive 1,000K (1 million) token context window, allowing it to process massive documents or codebases in a single prompt.
Run Claude Opus 4.8 privately
No prompt logging. No data used for training.