Key Takeaways
Llama 3.1 405B Instruct Long wins:
- Cheaper input tokens
- Cheaper output tokens
GPT-5 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
- Supports tool calls
Price Advantage
Llama 3.1 405B Instruct Long
Benchmark Advantage
GPT-5 Codex
Context Window
GPT-5 Codex
Speed
GPT-5 Codex
Pricing Comparison
Price Comparison
| Metric | Llama 3.1 405B Instruct Long | GPT-5 Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.90 | $1.25 | Llama 3.1 405B Instruct Long |
| Output (per 1M tokens) | $0.90 | $10.00 | Llama 3.1 405B Instruct Long |
| Cache Read (per 1M) | $0.45 | $0.13 | GPT-5 Codex |
Using a 3:1 input/output ratio, Llama 3.1 405B Instruct Long is 74% cheaper overall.
Llama 3.1 405B Instruct Long Providers
No provider data available
GPT-5 Codex Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
Llama 3.1 405B Instruct Long Wins
0
GPT-5 Codex Wins
Benchmark Scores
| Benchmark | Llama 3.1 405B Instruct Long | GPT-5 Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | - | 44.6 | - |
Coding Index Code generation & understanding | - | 38.9 | - |
Math Index Mathematical reasoning | - | 98.7 | - |
MMLU Pro Academic knowledge | - | 86.5 | - |
GPQA Graduate-level science | - | 83.7 | - |
LiveCodeBench Competitive programming | - | 84.0 | - |
GPT-5 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
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Other models
Context & Performance
Context Window
Llama 3.1 405B Instruct Long
N/A
tokens
GPT-5 Codex
400,000
tokens
Speed Performance
| Metric | Llama 3.1 405B Instruct Long | GPT-5 Codex | Winner |
|---|---|---|---|
| Tokens/second | N/A | 182.4 tok/s | |
| Time to First Token | N/A | 6.83s |
Capabilities
Feature Comparison
| Feature | Llama 3.1 405B Instruct Long | GPT-5 Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Llama 3.1 405B Instruct Long | GPT-5 Codex |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Meta-llama | OpenAI |
| Released | Unknown | Sep 2025 |
Llama 3.1 405B Instruct Long Modalities
Input
Output
GPT-5 Codex Modalities
Input
textimage
Output
text