Model comparison
GPT-5.4 Pro vs Claude Opus 4.5
- Input
- $30.00
- Output
- $180.00
- Context
- 1.05M
- Released
- 2026-03-05
- Input
- $5.00
- Output
- $25.00
- Context
- 200K
- Released
- 2025-11-24
GPT-5.4 Pro scores higher on 2 of the 2 benchmarks both models report; Claude Opus 4.5 is cheaper on input tokens ($5 vs $30 per 1M, 6×); GPT-5.4 Pro has the larger context window (1.05M vs 200K).
Specs and pricing side by side
| Spec | GPT-5.4 Pro | Claude Opus 4.5 |
|---|---|---|
| Maker | OpenAI | Anthropic |
| Released | 2026-03-05 | 2025-11-24 |
| Context window | 1.05M | 200K |
| Max output | 128K | 64K |
| Input price | $30.00 | $5.00 |
| Output price | $180.00 | $25.00 |
| Parameters | not published | Undisclosed |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Visionsame |
| Knowledge cutoff | August 31, 2025 | May 2025 |
Benchmarks both models report
| Benchmark | GPT-5.4 Pro | Claude Opus 4.5 |
|---|---|---|
| GPQA Diamond | 94.4% | 87% |
| ARC-AGI-2 | 83.3% | 37.6% |
Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.
Which one should you pick?
Pick GPT-5.4 Pro if…
- You care about GPQA Diamond, ARC-AGI-2 (it scores higher on 2 shared benchmarks).
- You need the longer context (1.05M vs 200K).
- Your use case is: long-horizon professional deliverables: financial models, slide decks, and legal analysis.
Pick Claude Opus 4.5 if…
- Cost matters: input tokens cost 6× less ($5 vs $30 per 1M).
- Your use case is: reach for it when you need a capable model for multi-step agentic coding and bug-fixing across real repositories.
FAQ
Which is better, GPT-5.4 Pro or Claude Opus 4.5?
GPT-5.4 Pro scores higher on 2 of the 2 benchmarks both models report; Claude Opus 4.5 is cheaper on input tokens ($5 vs $30 per 1M, 6×); GPT-5.4 Pro has the larger context window (1.05M vs 200K). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is Claude Opus 4.5?
GPT-5.4 Pro: $30.00 input, $180.00 output. Claude Opus 4.5: $5.00 input, $25.00 output (list API prices as published by each maker).
What are the context windows of GPT-5.4 Pro and Claude Opus 4.5?
GPT-5.4 Pro offers 1.05M with up to 128K output; Claude Opus 4.5 offers 200K with up to 64K output.
Is GPT-5.4 Pro newer than Claude Opus 4.5?
GPT-5.4 Pro was released 2026-03-05; Claude Opus 4.5 was released 2025-11-24.