GPT-4o vs Claude Sonnet 4.5: Which Model Should You Choose?
Head-to-head comparison of GPT-4o and Claude Sonnet 4.5. Analyze performance, pricing, and ideal use cases for your AI project.
Test Both Models FreeHead-to-Head Comparison
| Category | GPT-4o | Claude Sonnet 4.5 | Winner |
|---|---|---|---|
| Coding | Very Good | Excellent | Claude Sonnet 4.5 |
| Multimodal | Excellent | Good | GPT-4o |
| Instruction Following | Very Good | Excellent | Claude Sonnet 4.5 |
| Cost Efficiency | Good | Excellent | Claude Sonnet 4.5 |
GPT-4o
Key Strengths
- Native multimodal capabilities
- Real-time audio and vision processing
- Optimized for conversational AI
- Lower latency for interactive apps
Best For
Claude Sonnet 4.5
Key Strengths
- Best-in-class coding abilities
- Excellent instruction following
- Strong analytical capabilities
- Consistent output quality
Best For
Benchmark Performance
| Benchmark | GPT-4o | Claude Sonnet 4.5 | What It Measures |
|---|---|---|---|
| SWE-Bench | 33.2% | 49.0% | Real-world software engineering tasks |
| HumanEval | 90.2% | 93.7% | Python code generation accuracy |
| MMLU | 88.7% | 89.9% | Massive multitask language understanding |
| GSM8K | 95.8% | 96.4% | Grade school math reasoning |
Benchmark scores are approximate and may vary. Higher is better unless noted. Sources: official provider reports, public leaderboards.
Pricing Comparison
GPT-4o
Claude Sonnet 4.5
Our Verdict
GPT-4o and Claude Sonnet 4.5 represent the best of their respective providers. GPT-4o is the clear winner for multimodal applications — if you need native vision, audio processing, or real-time interaction, it's the only choice. Claude Sonnet 4.5 dominates in coding and technical tasks, consistently outperforming GPT-4o on code benchmarks. For development teams building code assistants, documentation tools, or technical workflows, Claude Sonnet offers better value. For consumer-facing products requiring low latency and multimodal input, GPT-4o is the better fit.
Frequently Asked Questions
Is Claude Sonnet 4.5 really better than GPT-4o for coding?
Yes, Claude Sonnet 4.5 consistently outperforms GPT-4o on coding benchmarks including SWE-Bench and HumanEval. It produces more structured, maintainable code and better follows complex coding instructions. However, GPT-4o is still very capable and may be preferred for its multimodal capabilities in development tools.
Which model has lower latency?
GPT-4o generally has lower first-token latency, making it better for interactive and real-time applications. Claude Sonnet 4.5 is still fast but optimized more for output quality than raw speed. For chatbot-style applications where perceived responsiveness matters, GPT-4o has a slight edge.
How do I choose between GPT-4o and Claude Sonnet?
Use GPT-4o if you need multimodal capabilities (vision, audio), real-time interaction, or are already deep in the OpenAI ecosystem. Choose Claude Sonnet if your primary use case is coding, technical documentation, data analysis, or any task requiring precise instruction following. PromptLens lets you test both side-by-side with the same prompts to see which performs better for your specific use case.
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Test GPT-4o and Claude Sonnet 4.5 Side by Side
Use PromptLens to run the same prompts on both models and compare outputs objectively. Find the best model for your use case.
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