TL;DR: GPTMuse adds nine new frontier models including Claude 4.5 series, GPT-5.2, OpenAI’s o3 reasoning models, and Gemini 3 previews.

Claude 4.5 Series

Anthropic’s latest generation brings significant improvements across the board.

Claude Opus 4.5: Flagship frontier reasoning model

  • Complex agentic workflows and deep analysis
  • 200k context with optional reasoning
  • €4.89 input / €24.44 output per million tokens

Claude Sonnet 4.5: State-of-the-art coding model

  • 1M context window for large codebases
  • Optional reasoning support
  • €2.93 input / €14.66 output per million tokens

Claude Haiku 4.5: Fast and cost-efficient

  • Matches Sonnet 4 performance at lower cost
  • 200k context with optional reasoning
  • €0.98 input / €4.89 output per million tokens

GPT-5.2 Series

OpenAI’s latest frontier models with enhanced reasoning.

GPT-5.2: Latest frontier model

  • Enhanced reasoning with mandatory effort-based thinking
  • 400k context window
  • €1.71 input / €13.68 output per million tokens

GPT-5.2 Pro: Premium high-compute variant

  • Maximum reasoning power for complex tasks
  • 400k context window
  • €20.53 input / €164.22 output per million tokens

OpenAI o3 Reasoning Models

New dedicated reasoning models for math, coding, and science.

o3: State-of-the-art reasoning

  • Optimized for complex problem solving
  • 200k context window
  • €1.95 input / €7.82 output per million tokens

o3-mini: Compact cost-efficient reasoning

  • Fast inference with strong reasoning
  • 200k context window
  • €1.08 input / €4.30 output per million tokens

Gemini 3 Preview Series

Google’s next-generation models now available in preview.

Gemini 3 Pro Preview: Flagship frontier model

  • Multimodal reasoning with optional thinking
  • 1M context window
  • €1.95 input / €11.73 output per million tokens

Gemini 3 Flash Preview: Fast multimodal model

  • High value with optional reasoning
  • 1M context window
  • €0.49 input / €2.93 output per million tokens

Deprecated Models

The following models have been marked as deprecated:

  • Gemini 1.5 Pro: Use Gemini 2.5 Pro or newer
  • Dolphin Mistral 24B Venice Edition: Use the free tier instead
  • Gemini 2.5 Flash Image Preview: Graduated to stable as Gemini 2.5 Flash Image

Getting Started

All models are available now at gpt-muse.com. Select any new model from the model picker when starting a conversation.