Reasoning Controls
OpenRouter lists GPT-5.5 with reasoning support and explicit reasoning-related request parameters.
Anthropic
Claude 4.8 Opus
Anthropic's most intelligent model, setting new standards in agentic coding, complex reasoning, and professional knowledge work.
May 27, 2026
$25.00 /MTok context
128,000 tokens output
Text
Image
File
Tools
Structured Output
Reasoning
Model Overview
High-signal model metadata in a structured two-column overview table.
Provider
The entity that provides this model.
Anthropic
Model ID
The routed model identifier exposed by upstream providers.
anthropic/claude-opus-4.8
Input Context Window
The number of tokens supported by the input context window.
$25.00 /MTok
tokens
Maximum Output Tokens
The number of tokens that can be generated by the model in a single request.
128,000 tokens
tokens
Open Source
Whether the model's code is available for public use.
No
Release Date
When the model was first released.
May 27, 2026
7 days ago
Knowledge Cut-off Date
When the model's knowledge was last updated.
Unknown
API Providers
The providers that offer this model. This is not an exhaustive list.
Google, Anthropic, Amazon Bedrock
Modalities
Types of data this model can process.
Text
Image
File
What is Claude 4.8 Opus
A fuller summary of positioning, capabilities, and source-specific details for Claude 4.8 Opus.
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...
Capabilities
What Claude 4.8 Opus supports
Structured Outputs
Structured output settings are exposed through OpenRouter for schema-driven or format-controlled responses.
Tool Calling
Tool invocation and tool selection are supported in the routed OpenRouter interface for this model.
Multimodal I/O
This model accepts text input, image input, file input and returns text output.
Large Context Window
OpenRouter currently lists a context window of $25.00 /MTok with up to 128,000 tokens maximum output tokens.
Pricing for Claude 4.8 Opus
Primary API pricing shown in the same “quick compare” spirit as the reference page.
Input tokens
$5.00
Per million tokens
Output tokens
$25.00
Per million tokens
Price Comparison
Additional usage-cost dimensions synced into the project for this model.
maxTemperature
1
maxResponseSize
128,000 tokens
API Access & Providers
Places where this model is available, based on the synced detail-page metadata.
Google
Anthropic
Amazon Bedrock
Provider Endpoints
Endpoint-level provider data currently available for this model.
Anthropic
Anthropic
Amazon Bedrock
Amazon Bedrock
Configuration & Parameters
The configurable options currently documented for this model.
Reasoning
SelectWhen enabled, the model will explain its thought process step-by-step before providing a final answer. This can help users understand how the model arrived at its conclusions, but may result in longer responses. Opus 4.7 uses adaptive thinking mode. The model dynamically decides when and how much to think.
Effort
SelectControls how much the model thinks vs. how quickly it responds. Higher effort produces better quality but uses more tokens and is slower. Recommended: High or Extra High for coding and agentic work; Medium for general use; Low for short, latency-sensitive tasks. Only applies when Reasoning is enabled.
Supported Request Parameters
Parameters currently listed by OpenRouter or the local catalog for this model.
Resources & Documentation
Official model cards, release notes, docs, and other references synced from the source page.
More models from Anthropic
Continue browsing adjacent models from the same provider.