LLMversus

InternLM 2.5 20B vs Llama 3.1 405B: Pricing, Benchmarks & Verdict (2026)

Pricing verified Sep 14, 2026By LLMversusUpdated September 17, 2026View methodology

⚡ Quick Answer

Compare InternLM 2.5 20B and Llama 3.1 405B across pricing, benchmarks, and capabilities.

Updated: September 14, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureInternLM 2.5 20BLlama 3.1 405B
ProviderShanghai AI LabMeta
Input Price / 1M tokens$0.180$3.00
Output Price / 1M tokens$0.180$3.00
Context Window
32K
128K
Max Output Tokens
4,096
4,096
Arena ELO
1,155
1,240
Coding ELO
1,150
1,200
TTFT (ms)
150
150
Tokens/sec
100
100
MultimodalNoNo
JSON ModeYesYes
Function CallingYesYes
VisionNoNo
When to Use InternLM 2.5 20B

InternLM 2.5 20B excels at cost-effective, general-purpose tasks.

Strengths:

  • Very affordable
  • Good instruction following
  • Fast

Best for:

cost-effectivegeneral-purpose
When to Use Llama 3.1 405B

Llama 3.1 405B excels at general-purpose, reasoning, long-context tasks.

Strengths:

  • Largest open model
  • Excellent reasoning
  • High quality outputs

Best for:

general-purposereasoninglong-context

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