Compare Models

Gemini 3.8 Flash

Gemini 3.8 Flash is a model from Google, released September 2, 2026. It ranks #17 of 49 models on the Vals Index with 54.89%. Its best result is #2 of 79 on Finance Agent (v2).

Release Date: Sep 2, 2026

Developer Google  🇺🇸
Context Window 1M
Max Output Tokens 66k
Token Costs (in/out) $1.50/7.50
Weights Private
Input Modalities

Accuracy

54.89 % ± 1.02

Cost / Test (Vals Index)

$ 5.713

Latency

51 min 52 s

Fallback Rate 0.00%
Refusal Rate 0.13%
Vals Index
BenchmarksAccuracyRankings
Vals Index

54.89%

±1.02
17/49
Vals RSI Index

19.93%

17/25
Vals Science Index

35.76%

±1.66
13/21
Code Migration

36.55%

±4.18
35/78
CUA-bench

4.17%

9/9
CyberBench v1.1

43.75%

±2.21
43/47
EMB

72.20%

±2.42
8/75
Finance Agent (v2)

61.44%

±0.13
2/79
Time Horizon Index: KSP

18.83%

±0.00
6/13
Legal Research Bench

38.94%

±3.39
32/79
MedCode

48.13%

±2.18
31/107
MedScribe

84.50%

±1.94
35/109
MortgageTax

65.34%

±0.94
44/98
MysteryMechanism

36.49%

±3.24
8/27
ProofBench v1.1

48.00%

±5.02
32/50
SAGE

35.06%

±3.36
69/91
Public Benefits Bench v1.1

65.29%

±1.24
22/50
SRE Bench

11.07%

±1.94
13/35
Tax Agent Bench

32.12%

±3.37
18/70
TaxEval v2

74.45%

±0.85
36/145
Vibe Code Bench 1-100

18.77%

±3.31
13/25
Vibe Code Bench v1.1

78.65%

±3.88
27/113
BioMysteryBench

62.22%

±1.70
23/27
Harvey's Legal Agent Benchmark

10.00%

±2.42
20/80
GPQA Diamond

94.44%

±1.48
4/138
IOI

56.94%

±2.26
19/44
LiveCodeBench

89.48%

±0.90
3/143
LegalBench

86.99%

±0.43
8/151
MMLU Pro

90.22%

±0.29
5/138
MMMU Pro

89.08%

±0.75
4/93
ProgramBench

1.00%

±0.70
17/64
SkillsBench

57.98%

±4.42
12/35
SWE-bench

80.00%

±1.79
24/88
SWE-bench Multimodal

40.83%

±2.25
16/20
Terminal-Bench 4.0

19.70%

±2.31
27/49
Terminal-Bench-Science

8.57%

±3.37
19/41
Proprietary BenchmarksAcademic BenchmarksIndustry Partners
Vals
Default Provider : Google
Temperature: 1
Top P: Default
Top K: Default
Max Output Tokens: 65,536
Reasoning Effort: high

Compared with

Gemini 3.8 Flash vs GPT-6 Sol 23 shared benchmarks Gemini 3.8 Flash vs Claude Opus 4.8 26 shared benchmarks Gemini 3.8 Flash vs GPT-5.6 Sol 35 shared benchmarks Gemini 3.8 Flash vs Muse Spark 1.3 14 shared benchmarks Gemini 3.8 Flash vs Grok 4.7 25 shared benchmarks Gemini 3.8 Flash vs GPT-6 Astra 26 shared benchmarks Gemini 3.8 Flash vs Claude Opus 5 35 shared benchmarks Gemini 3.8 Flash vs Claude Fable 5 25 shared benchmarks Gemini 3.8 Flash vs Muse Spark 1.3 Max 20 shared benchmarks Gemini 3.8 Flash vs Claude Opus 5.5 27 shared benchmarks