Key Takeaways
Claude Haiku 4.5 wins:
- Cheaper input tokens
- Cheaper output tokens
GPT-5.1-Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
Claude Haiku 4.5
Benchmark Advantage
GPT-5.1-Codex
Context Window
GPT-5.1-Codex
Speed
GPT-5.1-Codex
Pricing Comparison
Price Comparison
| Metric | Claude Haiku 4.5 | GPT-5.1-Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.00 | $1.25 | Claude Haiku 4.5 |
| Output (per 1M tokens) | $5.00 | $10.00 | Claude Haiku 4.5 |
| Cache Read (per 1M) | $0.10 | $0.13 | Claude Haiku 4.5 |
| Cache Write (per 1M) | $1.25 | N/A | Claude Haiku 4.5 |
Using a 3:1 input/output ratio, Claude Haiku 4.5 is 42% cheaper overall.
Claude Haiku 4.5 Providers
No provider data available
GPT-5.1-Codex Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
Claude Haiku 4.5 Wins
6
GPT-5.1-Codex Wins
Benchmark Scores
| Benchmark | Claude Haiku 4.5 | GPT-5.1-Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 31.1 | 43.1 | |
Coding Index Code generation & understanding | 29.6 | 36.6 | |
Math Index Mathematical reasoning | 39.0 | 95.7 | |
MMLU Pro Academic knowledge | 80.0 | 86.0 | |
GPQA Graduate-level science | 64.6 | 86.0 | |
LiveCodeBench Competitive programming | 51.1 | 84.9 |
GPT-5.1-Codex significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
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Claude Haiku 4.5
Other models
Context & Performance
Context Window
Claude Haiku 4.5
200,000
tokens
GPT-5.1-Codex
400,000
tokens
GPT-5.1-Codex has a 50% larger context window.
Speed Performance
| Metric | Claude Haiku 4.5 | GPT-5.1-Codex | Winner |
|---|---|---|---|
| Tokens/second | 113.2 tok/s | 131.9 tok/s | |
| Time to First Token | 0.42s | 7.06s |
GPT-5.1-Codex responds 17% faster on average.
Capabilities
Feature Comparison
| Feature | Claude Haiku 4.5 | GPT-5.1-Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Claude Haiku 4.5 | GPT-5.1-Codex |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | OpenAI |
| Released | Oct 2025 | Nov 2025 |
Claude Haiku 4.5 Modalities
Input
imagetext
Output
text
GPT-5.1-Codex Modalities
Input
textimage
Output
text