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GPT-4.5 vs Llama 3.1 405B Instruct
Comprehensive side-by-side LLM comparison
GPT-4.5 leads with 4.2% higher average benchmark score. Llama 3.1 405B Instruct offers 123.9K more tokens in context window than GPT-4.5. Llama 3.1 405B Instruct is $223.22 cheaper per million tokens. GPT-4.5 supports multimodal inputs. Llama 3.1 405B Instruct is available on 8 providers. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-4.5 was developed as an intermediate advancement between GPT-4 and GPT-5, designed to incorporate incremental improvements in reasoning, factuality, and instruction-following. Built to bridge generational capabilities while maintaining compatibility with existing applications, it represents a refinement of the GPT-4 architecture with enhanced performance characteristics.
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Meta
Llama 3.1 405B was developed as Meta's largest open-source language model, designed to provide frontier-level capabilities with 405 billion parameters. Built to demonstrate that open-source models can match proprietary systems in capability, it enables researchers and developers to experiment with and deploy a powerful foundation model without licensing restrictions.
7 months newer
Llama 3.1 405B Instruct
Meta
2024-07-23
GPT-4.5
OpenAI
2025-02-27
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Pricing Comparison
Cost per million tokens (USD)
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GPT-4.5
Input:$75.00
Output:$150.00
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Llama 3.1 405B Instruct
Input:$0.89
Output:$0.89($223.22 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 5 common benchmarks
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GPT-4.5
Average Score:86.7%(+4.2%)
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Llama 3.1 405B Instruct
Average Score:82.5%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-4.5
1 providers
OpenAI
Throughput: 50 tok/s
Latency: 20ms
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Llama 3.1 405B Instruct
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GPT-4.5
Avg Score:86.7%(+4.2%)
Providers:1
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Llama 3.1 405B Instruct
Avg Score:82.5%
Providers:8