Claude Opus 4 5 20251101 vs GPT 5.4
GPT 5.4 is 2.0× cheaper on input tokens than Claude Opus 4 5 20251101. GPT 5.4 has a longer context window (1M vs 200K). Both models are accessible via the haimaker.ai OpenAI-compatible API at https://api.haimaker.ai/v1.
Claude Opus 4 5 20251101
anthropic/claude-opus-4-5-20251101
Chat
Function CallingVisionReasoning
GPT 5.4
openai/gpt-5.4
Chat
Function CallingVisionReasoning
Side-by-side specifications
| Spec | Claude Opus 4 5 20251101 | GPT 5.4 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Full ID | anthropic/claude-opus-4-5-20251101 | openai/gpt-5.4 |
| Mode | chat | chat |
| Parameters | N/A | N/A |
| Context window | 200K | 1M |
| Max output | 64K | 128K |
| Input price (per 1M) | $5.00 | $2.50 |
| Output price (per 1M) | $25.00 | $15.00 |
| License | N/A | N/A |
| Architecture | N/A | N/A |
Feature support
| Feature | Claude Opus 4 5 20251101 | GPT 5.4 |
|---|---|---|
| Function Calling | ✓ Supported | ✓ Supported |
| Reasoning | ✓ Supported | ✓ Supported |
| Vision | ✓ Supported | ✓ Supported |
Frequently asked questions
Which is cheaper, Claude Opus 4 5 20251101 or GPT 5.4?
GPT 5.4 is cheaper at $2.50 per 1M input tokens vs $5.00 for Claude Opus 4 5 20251101.
Which has the larger context window, Claude Opus 4 5 20251101 or GPT 5.4?
GPT 5.4 accepts up to 1M input tokens vs 200K for Claude Opus 4 5 20251101.
Can I use both Claude Opus 4 5 20251101 and GPT 5.4 via the same API?
Yes. haimaker.ai exposes both anthropic/claude-opus-4-5-20251101 and openai/gpt-5.4 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 Claude Opus 4 5 20251101 or GPT 5.4 via the haimaker API
One OpenAI-compatible endpoint. Switch between them by changing the model parameter.