Key Takeaways
Claude Opus 4.5 wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Better at math
- Has reasoning mode
ChatGPT-4o wins:
- Cheaper output tokens
- Faster response time
Price Advantage
ChatGPT-4o
Benchmark Advantage
Claude Opus 4.5
Context Window
Claude Opus 4.5
Speed
ChatGPT-4o
Pricing Comparison
Price Comparison
| Metric | Claude Opus 4.5 | ChatGPT-4o | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $5.00 | $5.00 | Tie |
| Output (per 1M tokens) | $25.00 | $15.00 | ChatGPT-4o |
| Cache Read (per 1M) | $500000.00 | N/A | Claude Opus 4.5 |
| Cache Write (per 1M) | $6250000.00 | N/A | Claude Opus 4.5 |
Using a 3:1 input/output ratio, ChatGPT-4o is 25% cheaper overall.
Claude Opus 4.5 Providers
Amazon Bedrock $5.00 (Cheapest)
Google $5.00 (Cheapest)
Anthropic $5.00 (Cheapest)
ChatGPT-4o Providers
OpenAI $5.00 (Cheapest)
Azure $5.00 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
5
Claude Opus 4.5 Wins
0
ChatGPT-4o Wins
Benchmark Scores
| Benchmark | Claude Opus 4.5 | ChatGPT-4o | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 43.0 | 18.6 | |
Coding Index Code generation & understanding | 42.9 | - | - |
Math Index Mathematical reasoning | 62.7 | 25.7 | |
MMLU Pro Academic knowledge | 88.9 | 80.3 | |
GPQA Graduate-level science | 81.0 | 65.5 | |
LiveCodeBench Competitive programming | 73.8 | 42.5 | |
Aider Real-world code editing | - | 72.2 | - |
AIME Competition math | - | 32.7 | - |
Claude Opus 4.5 significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Claude Opus 4.5
Other models
Context & Performance
Context Window
Claude Opus 4.5
200,000
tokens
Max output: 64,000 tokens
ChatGPT-4o
128,000
tokens
Max output: 16,384 tokens
Claude Opus 4.5 has a 36% larger context window.
Speed Performance
| Metric | Claude Opus 4.5 | ChatGPT-4o | Winner |
|---|---|---|---|
| Tokens/second | 73.1 tok/s | 180.3 tok/s | |
| Time to First Token | 1.50s | 0.42s |
ChatGPT-4o responds 147% faster on average.
Capabilities
Feature Comparison
| Feature | Claude Opus 4.5 | ChatGPT-4o |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Claude Opus 4.5 | ChatGPT-4o |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | OpenAI |
| Released | Nov 2025 | Aug 2024 |
Claude Opus 4.5 Modalities
Input
fileimagetext
Output
text
ChatGPT-4o Modalities
Input
textimage
Output
text