GPT-4.1 vs LLaMA 3.1 405B — Which Is Better in 2026?
GPT-4.1 vs LLaMA 3.1 405B: independent head-to-head scored on Performance, Value, Reliability, and Ease of Use. See scores, pros, cons, and our verdict.
OpenAI
GPT-4.1
OpenAI's best coding model
Meta
LLaMA 3.1 405B
Best open-source LLM — free to run
8.9
Overall Score
WINNER7.8
Overall Score
Our Verdict
GPT-4.1 scores higher overall (8.9/10 vs 7.8/10), winning on Performance and Reliability. OpenAI's latest flagship. Best coding performance in the GPT family.
Pricing — GPT-4.1
API: $2/M input · $8/M output · Plus $20/mo
Pricing — LLaMA 3.1 405B
Free (self-hosted) · Cloud inference from $0.003/1K tokens
GPT-4.1
Pros
- ✓Best coding performance in the GPT family
- ✓Strong instruction following for agentic use
- ✓Full OpenAI tool ecosystem
Cons
- ✗More expensive than Claude Sonnet at API level
- ✗Less creative than Claude for writing tasks
- ✗Context window smaller than Gemini Pro
Best For
Software development, agentic workflows, enterprise OpenAI integrations
LLaMA 3.1 405B
Pros
- ✓Fully open-source weights — self-host for free
- ✓No data sent to third parties
- ✓Competitive with GPT-4 class models
Cons
- ✗Requires GPU infrastructure to run
- ✗No official support or SLA
- ✗Harder to set up than hosted solutions
Best For
Privacy-first deployments, open-source enthusiasts, budget-conscious teams with infrastructure
Choose GPT-4.1 if…
- →Performance is your top priority — GPT-4.1 leads by 0.8 points
- →Software development
- →You also value Reliability — GPT-4.1 wins that dimension too
Choose LLaMA 3.1 405B if…
- →Value is your top priority — LLaMA 3.1 405B leads by 1.5 points
- →Privacy-first deployments
- →Meta support, documentation, and community suit your team
Frequently Asked Questions
Is GPT-4.1 better than LLaMA 3.1 405B?
GPT-4.1 scores 8.9/10 overall vs 7.8/10 for LLaMA 3.1 405B, with an edge on Performance and Reliability and Ease of Use. That said, "LLaMA 3.1 405B" may be the better pick if value is your priority. The right choice depends on your use case.
What is the pricing difference between GPT-4.1 and LLaMA 3.1 405B?
GPT-4.1: API: $2/M input · $8/M output · Plus $20/mo. LLaMA 3.1 405B: Free (self-hosted) · Cloud inference from $0.003/1K tokens. Compare usage volumes and features needed to determine total cost of ownership for your team.
Which is better for software development?
GPT-4.1 is generally stronger here, scoring 8.9/10 overall. OpenAI's latest flagship. Best coding performance in the GPT family. For more niche requirements like value, LLaMA 3.1 405B may be worth evaluating.
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