GPT 5.4 vs Claude Sonnet 4 6
GPT 5.4 is 1.2× cheaper on input tokens than Claude Sonnet 4 6. GPT 5.4 has a longer context window (1M vs 1M). Both models are accessible via the haimaker.ai OpenAI-compatible API at https://api.haimaker.ai/v1.
GPT 5.4
openai/gpt-5.4
Chat
Function CallingVisionReasoning
Claude Sonnet 4 6
anthropic/claude-sonnet-4-6
Chat
Function CallingVisionReasoning
Side-by-side specifications
| Spec | GPT 5.4 | Claude Sonnet 4 6 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Full ID | openai/gpt-5.4 | anthropic/claude-sonnet-4-6 |
| Mode | chat | chat |
| Parameters | N/A | N/A |
| Context window | 1M | 1M |
| Max output | 128K | 64K |
| Input price (per 1M) | $2.50 | $3.00 |
| Output price (per 1M) | $15.00 | $15.00 |
| License | N/A | N/A |
| Architecture | N/A | N/A |
Feature support
| Feature | GPT 5.4 | Claude Sonnet 4 6 |
|---|---|---|
| Function Calling | ✓ Supported | ✓ Supported |
| Reasoning | ✓ Supported | ✓ Supported |
| Vision | ✓ Supported | ✓ Supported |
Frequently asked questions
Which is cheaper, GPT 5.4 or Claude Sonnet 4 6?
GPT 5.4 is cheaper at $2.50 per 1M input tokens vs $3.00 for Claude Sonnet 4 6.
Which has the larger context window, GPT 5.4 or Claude Sonnet 4 6?
GPT 5.4 accepts up to 1M input tokens vs 1M for Claude Sonnet 4 6.
Can I use both GPT 5.4 and Claude Sonnet 4 6 via the same API?
Yes. haimaker.ai exposes both openai/gpt-5.4 and anthropic/claude-sonnet-4-6 on the same OpenAI-compatible endpoint at https://api.haimaker.ai/v1, so you can switch between them by changing the model parameter in your request.
Try GPT 5.4 or Claude Sonnet 4 6 via the haimaker API
One OpenAI-compatible endpoint. Switch between them by changing the model parameter.