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Grok 4.20 0309 v2 vs Jamba 1.5 Large

xAI vs AI21 Labs — benchmarks, pricing, and capabilities side by side.

  • Grok 4.20 0309 v2 has the higher intelligence index (91.1 vs 42.8)
  • Grok 4.20 0309 v2 is faster
Grok 4.20 0309 v2Jamba 1.5 Large
Intelligence index91.142.8
DeveloperxAIAI21 Labs
TypeLLMLLM
AccessOpen weights
Context window256,000 tokens
Input price$2.00 / 1M$2.00 / 1M
Output price$6.00 / 1M$8.00 / 1M
Speed105 tok/s100 tok/s
ReleasedApril 7, 2026August 22, 2024
Parameters398000000000
Input modalities
Output modalities

Shared benchmarks

Grok 4.20 0309 v2
Jamba 1.5 Large
GPQA Diamond
91.1
36.9
Humanity’s Last Exam
32.2
4