Existing Opus 4.8 applications
Keep a stable, evaluated production baseline while testing whether Opus 5 materially improves the workload.
Independent tool overview
Claude Opus 4.8 at a glance
Claude Opus 4.8 is a supported previous-generation Anthropic model for complex coding, agentic workflows and professional analysis. It offers a one-million-token context window and 128,000-token output limit, but Claude Opus 5 is now the direct upgrade at the same standard API price.
Visit the official Claude Opus 4.8 site ↗
- Status
- Supported previous generation
- API model ID
- claude-opus-4-8
- Context window
- 1 million tokens
- Maximum output
- 128,000 tokens
Overview
What Claude Opus 4.8 is
Anthropic released Claude Opus 4.8 in May 2026 as an upgrade focused on reliability, coding, long-running agents and professional work. It added adaptive thinking improvements, mid-conversation system messages, documented refusal details and an optional faster inference mode.
The model remains available through the Claude API and supported cloud platforms with the ID claude-opus-4-8. Its published specifications include a one-million-token context window, up to 128,000 output tokens, text and image input, prompt caching, batch processing, PDF support, computer use and other tool integrations.
Claude Opus 5 replaced it as the current Opus generation in July 2026 at the same $5-per-million input and $25-per-million output standard rates. Existing 4.8 applications do not need to migrate blindly: regression-test quality, tool behavior, thinking-token use and feature availability first, because Opus 5 changes the default thinking behavior and lacks some 4.8 platform features.
Use cases
Who Claude Opus 4.8 is best for
The strongest fit depends on the job you need the product to complete, not the size of its feature list.
Complex coding agents
Use the model for multi-step software work that needs long context, tool calls and sustained reasoning.
Long-document analysis
Process large document sets, PDFs and professional material when a high-capability model and a large context window are worth the cost.
Capabilities
Core Claude Opus 4.8 features
Million-token context
Accepts up to one million tokens of context on the Claude API and supported cloud platforms.
Adaptive thinking
Can allocate reasoning effort when a turn needs it instead of requiring a fixed thinking budget for every request.
Agent and tool support
Supports function tools, computer use, prompt caching, batch processing, files, PDFs and vision for complex workflows.
Fast mode
An API research preview can deliver up to 2.5 times higher output speed using the same model at premium token rates.
Process
How the Claude Opus 4.8 workflow works
Step 1
Define the baseline
Capture task-success, latency, token use and human-review results from the current Opus 4.8 implementation.
Step 2
Control effort and context
Set an appropriate effort level, trim irrelevant context and use prompt caching for repeated large prefixes.
Step 3
Run tool-aware evaluations
Test not only answer quality but also tool selection, argument accuracy, recovery behavior and final task completion.
Step 4
Compare the successor
Evaluate Opus 5 on the same cases and review its thinking defaults and feature differences before changing the production model ID.
Cost
Claude Opus 4.8 pricing and free plan
Claude Opus 4.8 costs $5 per million input tokens and $25 per million output tokens at standard API speed. Fast mode costs $10 input and $50 output per million tokens. Prompt caching, batches and third-party cloud platforms have separate rates or discounts.
Standard API
$5 input / $25 output
Claude API rates per one million tokens.
- Output includes reasoning tokens
- Prompt caching priced separately
- Batch processing can reduce token rates
Fast mode
$10 input / $50 output
Premium research-preview inference for higher output speed.
- Up to 2.5x higher output tokens per second
- Same model weights and behavior
- Available only on supported Claude API access
Claude apps
Plan-dependent
Availability and limits in Claude, Claude Code and related apps depend on the user's subscription.
- Not billed with direct API token rates
- Usage limits apply
- Opus 5 is now the newer default on eligible plans
Pricing checked . Check current pricing at the source ↗
Assessment
Claude Opus 4.8 strengths and limitations
Where it stands out
- Large context and output limits support long, multi-stage professional workflows
- Broad tool, vision, PDF, caching and batch support makes it a capable agent foundation
- Mature production option for teams that already evaluated and tuned 4.8 behavior
What to consider
- Opus 5 is the direct successor and offers improved capability at the same standard token price
- At $25 per million output tokens, long reasoning and verbose agent traces can become expensive
- Migration behavior is not identical: thinking defaults and some platform features differ between 4.8 and Opus 5
Compare
Claude Opus 4.8 alternatives
The right alternative depends on the specific output, workflow, controls and budget your project requires.
Consumer
Claude Sonnet 5
Choose Claude Sonnet 5 when lower cost and faster execution matter more than maximum Opus-class capability.
Explore Claude Sonnet 5 →Consumer
Gemini 3
Consider the Gemini 3 family for a broader range of multimodal, media and cost-optimized model endpoints.
Explore Gemini 3 →Consumer
GPT 5.4
Consider GPT-5.4 when the application is already built around OpenAI's API and tool ecosystem.
Explore GPT 5.4 →Questions
Claude Opus 4.8 FAQs
Is Claude Opus 4.8 still available?
Yes. Anthropic's current platform documentation still lists claude-opus-4-8 as an available model, though Claude Opus 5 is its direct successor.
How much does the Claude Opus 4.8 API cost?
Standard API pricing is $5 per million input tokens and $25 per million output tokens. Fast mode is $10 input and $50 output per million tokens.
What are Claude Opus 4.8's context and output limits?
Anthropic lists a one-million-token context window and a 128,000-token maximum output for the model on its current platform comparison.
Should I migrate from Opus 4.8 to Opus 5?
Opus 5 is the stronger direct successor at the same standard price, but test it on your own evaluation set first. Review thinking-token behavior and feature differences before changing a production model ID.
Bottom line
Our Claude Opus 4.8 verdict
Claude Opus 4.8 remains a strong and supported model for production systems that already depend on its behavior and broad tool support. New projects should compare it directly with Opus 5 and Sonnet 5; at equal standard pricing, 4.8 mainly wins when its evaluated stability or specific feature support matters.
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