Best Large Context Window LLMs in 2026

AI models with the largest context windows (200K+ tokens), ranked by benchmark performance.

GPT-5.4
OpenAIProprietary1M

88

overall

Gemini 3.1 Pro
GoogleProprietary1M

87

overall

Claude Opus 4.6
AnthropicProprietary1M

86

overall

4
GPT-5.3 Codex
OpenAIProprietary400K

85

overall

5
GPT-5.2
OpenAIProprietary400K

83

overall

6
GPT-5.2-Codex
OpenAIProprietary400K

82

overall

7
Gemini 3 Pro Deep Think
GoogleProprietary2M

81

overall

8
Claude Sonnet 4.6
AnthropicProprietary1M

80

overall

9
Claude Opus 4.5
AnthropicProprietary200K

79

overall

10
Gemini 3 Pro
GoogleProprietary2M

78

overall

11
GPT-5.1-Codex-Max
OpenAIProprietary400K

77

overall

12
GPT-5.1
OpenAIProprietary400K

76

overall

13
GLM-5 (Reasoning)
Zhipu AIOpen Weight200K

75

overall

14
Claude Sonnet 4.5
AnthropicProprietary1M

74

overall

15
Grok 4.1 Fast
xAIProprietary2M

73

overall

16
o1-preview
OpenAIProprietary200K

71

overall

17
o3-pro
OpenAIProprietary200K

68

overall

18
GLM-5
Zhipu AIOpen Weight200K

68

overall

19
o3
OpenAIProprietary200K

67

overall

20
GLM-4.7
Zhipu AIOpen Weight200K

67

overall

21
Qwen2.5-1M
AlibabaOpen Weight1M

66

overall

22
o4-mini (high)
OpenAIProprietary200K

65

overall

23
Gemini 2.5 Pro
GoogleProprietary2M

65

overall

24
Claude 4.1 Opus
AnthropicProprietary200K

61

overall

25
Claude 4 Sonnet
AnthropicProprietary200K

59

overall

26
Gemini 3 Flash
GoogleProprietary1M

58

overall

27
Claude Haiku 4.5
AnthropicProprietary200K

57

overall

28
GLM-4.7-Flash
Zhipu AIOpen Weight200K

56

overall

29
Claude 3.5 Sonnet
AnthropicProprietary200K

55

overall

30
Gemini 1.5 Pro
GoogleProprietary2M

54

overall

31
Grok Code Fast 1
xAIProprietary256K

54

overall

32
Gemini 3.1 Flash-Lite
GoogleProprietary1M

53

overall

33
Claude 3 Opus
AnthropicProprietary200K

51

overall

34
Claude 3 Haiku
AnthropicProprietary200K

46

overall

35
Gemini 2.5 Flash
GoogleProprietary1M

41

overall

36
Claude 4.1 Opus Thinking
AnthropicProprietary200K

29

overall

Key Takeaways

  • The top model is GPT-5.4 by OpenAI with a score of 88.
  • The best open-weight model in this ranking is GLM-5 (Reasoning) at position #13.
  • 36 models are included in this ranking.