Supported Models

Choose the right AI model for your use case

Model Selection Guide

Fine-Tune Lab supports major AI providers with a unified API. Choose based on your needs:

Speed

Claude Haiku 4.5, GPT-5 Mini, GPT-4.1 Mini

Cost

GPT-4.1 Mini, GPT-5 Mini, Claude 3 Haiku

Intelligence

GPT-5 Pro, Claude Sonnet 4.5, GPT-5

O

OpenAI Models

GPT-5 family with vision support

Most Advanced

GPT o3-Pro

OpenAI's most advanced reasoning model with unprecedented problem-solving capabilities.

Model ID:o3-pro
Context:256K tokens
Input:$20.00 / 1M tokens
Output:$80.00 / 1M tokens

Strengths

  • Unprecedented reasoning depth
  • Complex mathematical proofs
  • Advanced scientific analysis
  • Multi-step logical deduction

Best For

Research and academic workComplex mathematical problemsAdvanced scientific computingCompetitive programming
Most Powerful

⚠️ Premium Pricing - Use With Caution

This model is 10x more expensive than standard models. Recommended primarily for LLM-as-a-Judge evaluations where superior reasoning is critical. Budget carefully.

GPT-5 Pro

Most advanced GPT-5 model with highest reasoning effort for complex multi-step tasks.

Model ID:gpt-5-pro
Context:256K tokens
Input:$15.00 / 1M tokens
Output:$120.00 / 1M tokens

Strengths

  • Highest reasoning capability
  • Advanced multi-step problem solving
  • Complex code architecture
  • Research-level analysis

Best For

Complex system designAdvanced research tasksMulti-step reasoningCode refactoring at scale
Recommended

GPT-5

Latest generation model with advanced reasoning and vision capabilities.

Model ID:gpt-5-chat
Context:256K tokens
Input:$1.25 / 1M tokens
Output:$10.00 / 1M tokens

Strengths

  • Advanced reasoning
  • Multimodal (text + vision)
  • Extended context window
  • Tool use and function calling

Best For

Complex conversationsVision-based tasksAdvanced code generationLong document analysis

GPT-5 Mini

Compact GPT-5 model optimized for speed and cost while maintaining strong capabilities.

Model ID:gpt-5-mini
Context:256K tokens
Input:$0.25 / 1M tokens
Output:$2.00 / 1M tokens

Strengths

  • Fast inference speed
  • Cost-effective
  • GPT-5 architecture benefits
  • Large context window

Best For

High-volume applicationsReal-time chatContent generationQuick analysis tasks

GPT-4.1 Mini

Fast and cost-effective GPT-4.1 model for most tasks with vision support.

Model ID:gpt-4.1-mini
Context:128K tokens
Input:$0.40 / 1M tokens
Output:$1.60 / 1M tokens

Strengths

  • Fast response times
  • Cost-effective
  • Multimodal (text + vision)
  • Good for most tasks

Best For

Chat applicationsContent moderationData extractionSimple classification
A

Anthropic Models

Claude 4.5 and Claude 3 families with extended context

Recommended
Latest

Claude Sonnet 4.5

Next-generation Claude model with enhanced reasoning, vision, and extended context.

Model ID:claude-sonnet-4.5
Context:300K tokens
Input:$3.00 / 1M tokens
Output:$15.00 / 1M tokens

Strengths

  • Enhanced reasoning capabilities
  • Extended 300K context
  • Advanced vision support
  • Superior code generation

Best For

Complex software architectureLong document analysisAdvanced vision tasksMulti-file code review

Claude Haiku 4.5

Ultra-fast Claude 4.5 model optimized for speed and cost with vision support.

Model ID:claude-haiku-4.5
Context:300K tokens
Input:$1.00 / 1M tokens
Output:$5.00 / 1M tokens

Strengths

  • Fastest Claude model
  • Extended context window
  • Vision capabilities
  • Cost-effective for scale

Best For

Real-time chat applicationsHigh-volume processingQuick image analysisContent moderation at scale

Claude 3.5 Sonnet

Anthropic's most intelligent Claude 3 model with strong coding and reasoning.

Model ID:claude-3-5-sonnet-20241022
Context:200K tokens
Input:$3.00 / 1M tokens
Output:$15.00 / 1M tokens

Strengths

  • Excellent coding abilities
  • Strong analytical reasoning
  • Nuanced responses
  • Vision support

Best For

Software developmentTechnical writingData analysisResearch assistance

Claude 3 Opus

Most powerful Claude 3 model for highly complex tasks requiring deep reasoning.

Model ID:claude-3-opus-20240229
Context:200K tokens
Input:$15.00 / 1M tokens
Output:$75.00 / 1M tokens

Strengths

  • Highest intelligence (Claude 3)
  • Complex reasoning
  • Long-form content
  • Vision capabilities

Best For

Complex problem solvingResearch-level analysisStrategic planningAdvanced creative writing

Claude 3 Haiku

Fast, compact Claude 3 model for quick responses and cost efficiency.

Model ID:claude-3-haiku-20240307
Context:200K tokens
Input:$0.25 / 1M tokens
Output:$1.25 / 1M tokens

Strengths

  • Very fast responses
  • Most cost-effective (Claude 3)
  • Good for simple tasks
  • Large context support

Best For

Customer support chatbotsContent moderationQuick Q&AHigh-volume processing

Using Models in API

Example: Chat Completion

OpenAI Model

curl -X POST https://your-app.com/api/chat \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "messages": [
      {
        "role": "user",
        "content": "Explain quantum computing"
      }
    ],
    "model": "gpt-4o-mini",
    "temperature": 0.7
  }'

Anthropic Model

curl -X POST https://your-app.com/api/chat \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "messages": [
      {
        "role": "user",
        "content": "Explain quantum computing"
      }
    ],
    "model": "claude-3-5-sonnet-20241022",
    "temperature": 0.7
  }'

Unified API

All models use the same API format. Just change the model parameter to switch providers.

Next Steps

Quick Start

Make your first API call

API Reference

Complete API documentation

Guides

Step-by-step tutorials