> ## Documentation Index
> Fetch the complete documentation index at: https://docs.radium.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# Models overview

> Compare Radium's three inference tiers

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# Models overview

Radium serves three tuned model tiers through OpenAI- and Anthropic-compatible endpoints. The tiers map directly to the frontier model families you already know.

## Comparison

| | Hal 1.0 | Clarke 1.0 | Tycho 1.0 |
| - | - | - | - |
| **Class** | Opus-class | Sonnet-class | Haiku-class |
| **Best for** | Complex reasoning, multi-step agents, deep code analysis | RAG, copilots, code assistance, structured outputs | Classification, extraction, summarization, routing |
| **Context window** | 250,000 tokens | 1,000,000 tokens | 125,000 tokens |

## Which tier replaces the model you use today

| Frontier model | Radium equivalent |
| - | - |
| <span style="color:red">GPT-5</span> / <span style="color:red">o3</span> | Hal 1.0 |
| <span style="color:red">GPT-5-mini</span> / <span style="color:red">GPT-4.1</span> | Clarke 1.0 |
| <span style="color:red">Claude 4 Opus</span> | Hal 1.0 |
| <span style="color:red">Claude 4 Sonnet</span> | Clarke 1.0 |
| <span style="color:red">Claude 4 Haiku</span> | Tycho 1.0 |

Hal 1.0 is for reasoning: agents that decompose problems, generate structured plans, or write long programs. Use it when the task pays for quality. Clarke 1.0 is the default for most workloads: RAG, copilots, tool calls and any system where latency and cost matter. Tycho 1.0 is for high-volume automation: classification, entity extraction, summarization, routing. Send a request to Tycho when you would have used a classifier model or a rules engine.

## Capabilities matrix

| Capability | Hal 1.0 | Clarke 1.0 | Tycho 1.0 |
| - | - | - | - |
| Streaming | Supported | Supported | Supported |
| Tool calling | Supported | Supported | Supported |
| JSON mode | Supported | Supported | Supported |
| JSON schema | Supported | Supported | Supported |
| Reasoning | Supported | Supported | Not supported |
| Vision input | Supported | Supported | Not supported |


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