Model comparison
Claude Opus 4.5 vs GPT-5
- Input
- $5.00
- Output
- $25.00
- Context
- 200K
- Released
- 2025-11-24
- Input
- $1.25 / 1M tokens
- Output
- $10.00 / 1M tokens
- Context
- 400K
- Released
- 2025-08-07
Claude Opus 4.5 scores higher on 2 of the 3 benchmarks both models report (the other leads on 1); GPT-5 is cheaper on input tokens ($1.3 vs $5 per 1M, 4×); GPT-5 has the larger context window (400K vs 200K).
Specs and pricing side by side
| Spec | Claude Opus 4.5 | GPT-5 |
|---|---|---|
| Maker | Anthropic | OpenAI |
| Released | 2025-11-24 | 2025-08-07 |
| Context window | 200K | 400K |
| Max output | 64K | 128K |
| Input price | $5.00 | $1.25 / 1M tokens |
| Output price | $25.00 | $10.00 / 1M tokens |
| Parameters | Undisclosed | Not disclosed |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Visionsame |
| Knowledge cutoff | May 2025 | September 30, 2024 |
Benchmarks both models report
| Benchmark | Claude Opus 4.5 | GPT-5 |
|---|---|---|
| SWE-bench Verified | 80.9% | 74.9% |
| Aider Polyglot | 89.4% | 88% |
| GPQA Diamond | 87% | 88.4% |
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 Claude Opus 4.5 if…
- You care about SWE-bench Verified, Aider Polyglot (it scores higher on 2 shared benchmarks).
- Your use case is: reach for it when you need a capable model for multi-step agentic coding and bug-fixing across real repositories.
Pick GPT-5 if…
- You care about GPQA Diamond (it scores higher on 1 shared benchmark).
- Cost matters: input tokens cost 4× less ($1.3 vs $5 per 1M).
- You need the longer context (400K vs 200K).
- Your use case is: agentic coding: multi-step bug fixing, refactoring, and pull-request-scale changes across a repository.
FAQ
Which is better, Claude Opus 4.5 or GPT-5?
Claude Opus 4.5 scores higher on 2 of the 3 benchmarks both models report (the other leads on 1); GPT-5 is cheaper on input tokens ($1.3 vs $5 per 1M, 4×); GPT-5 has the larger context window (400K 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 GPT-5?
Claude Opus 4.5: $5.00 input, $25.00 output. GPT-5: $1.25 / 1M tokens input, $10.00 / 1M tokens output (list API prices as published by each maker).
What are the context windows of Claude Opus 4.5 and GPT-5?
Claude Opus 4.5 offers 200K with up to 64K output; GPT-5 offers 400K with up to 128K output.
Is Claude Opus 4.5 newer than GPT-5?
Claude Opus 4.5 was released 2025-11-24; GPT-5 was released 2025-08-07.