LLaMA 3.1 405B vs OpenAI o1 — Which Is Better in 2026?
LLaMA 3.1 405B vs OpenAI o1: independent head-to-head scored on Performance, Value, Reliability, and Ease of Use. See scores, pros, cons, and our verdict.
Meta
LLaMA 3.1 405B
Best open-source LLM — free to run
OpenAI
OpenAI o1
Best AI for hard reasoning and math
7.8
Overall Score
8.0
Overall Score
WINNEROur Verdict
OpenAI o1 scores higher overall (8.0/10 vs 7.8/10), winning on Performance and Reliability. Best AI for hard reasoning, math, and science. Expensive and slow but uniquely powerful.
Pricing — LLaMA 3.1 405B
Free (self-hosted) · Cloud inference from $0.003/1K tokens
Pricing — OpenAI o1
API: $15/M input · $60/M output · Pro plan
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
OpenAI o1
Pros
- ✓Best multi-step mathematical reasoning available
- ✓Excels at PhD-level problem solving
- ✓Think-before-answer approach reduces errors
Cons
- ✗Much slower than standard GPT models
- ✗Very expensive for routine use
- ✗Not suitable for conversational or creative tasks
Best For
Complex math, scientific reasoning, hard coding challenges, research problems
Choose LLaMA 3.1 405B if…
- →Value is your top priority — LLaMA 3.1 405B leads by 3.5 points
- →Privacy-first deployments
- →Meta support, documentation, and community suit your team
Choose OpenAI o1 if…
- →Performance is your top priority — OpenAI o1 leads by 1.0 points
- →Complex math
- →You also value Reliability — OpenAI o1 wins that dimension too
Frequently Asked Questions
Is LLaMA 3.1 405B better than OpenAI o1?
OpenAI o1 scores 8.0/10 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 LLaMA 3.1 405B and OpenAI o1?
LLaMA 3.1 405B: Free (self-hosted) · Cloud inference from $0.003/1K tokens. OpenAI o1: API: $15/M input · $60/M output · Pro plan. Compare usage volumes and features needed to determine total cost of ownership for your team.
Which is better for complex math?
OpenAI o1 is generally stronger here, scoring 8.0/10 overall. Best AI for hard reasoning, math, and science. Expensive and slow but uniquely powerful. For more niche requirements like value, LLaMA 3.1 405B may be worth evaluating.
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