Looking for an honest OpenAI GPT-4.5 vs Meta Llama 4 Behemoth comparison in 2026? We scored both ai language models on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. In our overall scoring the Meta Llama 4 Behemoth comes out ahead 51/100 to 81/100 — a 30-point gap. The widest gap is in camera quality, where the Meta Llama 4 Behemoth pulls noticeably ahead.
OpenAI
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Meta Llama 4 Behemoth clearly outperforms the OpenAI GPT-4.5 in the ai language models category, especially in value, scoring 81 vs 51. If you want the better overall ai language models, Meta Llama 4 Behemoth is the recommended choice.
Scores are relative within the ai language modelscategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
✓ Pros
✗ Cons
✓ Pros
✗ Cons
Lower cost = better value. Free = open-source self-hosted.
| Metric | OpenAI GPT-4.5 | 4 Behemoth |
|---|---|---|
| Input (Prompt) | $75.00/1M | ✓Free/1M |
| Output (Completion) | $150.00/1M | ✓Free/1M |
| Open Source | Proprietary | ✓ Free |
Context Window (tokens)
| Metric | OpenAI GPT-4.5 | 4 Behemoth |
|---|---|---|
| Max Output | ✓16,384 tok | 8,192 tok |
| Speed | ✓50 tok/s | 15 tok/s |
| Time to First Token | ✓900ms | 2.0s |
| Languages | 50+ | 50+ |
Higher is better. Industry-standard AI evaluation benchmarks.
OpenAI GPT-4.5
4 Behemoth
OpenAI GPT-4.5
4 Behemoth
OpenAI GPT-4.5
4 Behemoth
OpenAI GPT-4.5
4 Behemoth
OpenAI GPT-4.5
4 Behemoth
| Feature | OpenAI GPT-4.5 | 4 Behemoth |
|---|---|---|
| Reasoning / Chain-of-Thought | ✕ | ✓ |
| Vision (Image Input) | ✓ | ✓ |
| Audio Input | ✕ | ✕ |
| Video Input | ✕ | ✕ |
| Image/Audio Output | ✕ | ✕ |
| Function Calling / Tools | ✓ | ✓ |
| JSON Mode | ✓ | ✓ |
| Real-time Web Access | ✕ | ✕ |
| Fine-tuning Support | ✕ | ✓ |
| Batch API | ✓ | ✕ |
| Streaming | ✓ | ✓ |
| Open Source | ✕ | ✓ |
| Field | OpenAI GPT-4.5 | 4 Behemoth |
|---|---|---|
| Provider | OpenAI | Meta |
| Parameters | — | 2000B |
| Knowledge Cutoff | 2024-09 | 2025-03 |
| Best For | creative writingemotional intelligenceconversationnuanced tasks | researchmultimodalopen sourcesciencemath |
Buy OpenAI GPT-4.5 if…
The OpenAI GPT-4.5 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Buy Meta Llama 4 Behemoth if…
Buy the Meta Llama 4 Behemoth if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Meta Llama 4 Behemoth clearly outperforms the OpenAI GPT-4.5 in the ai language models category, especially in value, scoring 81 vs 51. If you want the better overall ai language models, Meta Llama 4 Behemoth is the recommended choice.
No, Meta Llama 4 Behemoth scores higher (75 vs 75).
Check the latest prices using the buy links above.
The OpenAI GPT-4.5 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Buy the Meta Llama 4 Behemoth if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Reviewed by VersusMatrix Editorial Team
Last updated: April 28, 2026
Methodology: AI-powered analysis of technical specifications from manufacturer data. Scores are calculated by comparing products across multiple dimensions and normalized relative to the full category database. Our editorial process is independent and not influenced by affiliate partnerships.