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DeepSeek: DeepSeek V4 Flash vs OpenAI: gpt-oss-120b

Summary

DeepSeek V4 Flash vs gpt-oss-120b benchmark comparison: gpt-oss-120b leads on average score with 6.1 vs 5.0. DeepSeek V4 Flash has the lower benchmark cost at $0.008 vs $0.013. gpt-oss-120b is faster at 22.28s vs 26.75s, with pass rates of 30.2% vs 52.4%.

Recommended model: gpt-oss-120b - It has the strongest score in this comparison (6.1) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-06-04

Metric DeepSeek V4 Flash DeepSeek V4 Flash none Release: 2026-04-24 gpt-oss-120b gpt-oss-120b medium Release: 2025-08-05 Free Available
Score 5.0 6.1
Rank #139 #99
Reliability 10.0 10.0
Consistency 8.9 8.0
Tests Correct
Attempt pass rate 30.2% 52.4%
Flaky tests 3 5
Total Runs 63 63
Cost per result 0.203 0.141
Total Cost $0.008 $0.013
Input Price $0.099 / 1M $0.039 / 1M
Output Price $0.197 / 1M $0.180 / 1M
Total Input Tokens 50,127 39,084
Output Tokens 13,710 20,013
Reasoning Tokens 0 50,233
Response Time (avg) 26.75s 22.28s
Response Time (max) 111.96s 68.16s
Response Time (total) 561.82s 311.96s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#139 DeepSeek V4 Flash

none
Cost
$0.004
Time
157.6s
Tokens
11,297 tok

#99 gpt-oss-120b

medium
Cost
$0.001
Time
26.7s
Tokens
555 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 3.0 10.0 0.0% 0 20.18s 540 174 0
gpt-oss-120b 6.7 9.9 50.0% 0 10.21s 1,314 3,518 2,177
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 4.2 7.4 11.1% 1 17.13s 7,279 9,717 0
gpt-oss-120b 5.9 7.0 55.6% 1 38.37s 7,782 3,365 11,973
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 4.5 2.1 66.7% 1 111.96s 24,398 2,664 0
gpt-oss-120b 10.0 10.0 100.0% 0 31.18s 11,535 694 5,072
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 10.0 10.0 100.0% 0 23.79s 7,290 195 0
gpt-oss-120b 6.4 5.9 66.7% 1 1.98s 7,476 241 1,114
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 5.3 10.0 33.3% 0 19.73s 666 18 0
gpt-oss-120b 2.9 4.4 22.2% 2 50.92s 1,266 6,784 20,606
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 4.2 9.9 0.0% 0 23.74s 471 67 0
gpt-oss-120b 4.3 10.0 0.0% 0 7.90s 659 107 387
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 6.5 10.0 50.0% 0 17.54s 627 321 0
gpt-oss-120b 9.9 10.0 100.0% 0 7.63s 1,036 126 1,799
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 3.1 7.3 11.1% 1 23.72s 594 207 0
gpt-oss-120b 5.3 7.2 44.4% 1 21.71s 1,190 1,790 2,264
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 10.0 10.0 100.0% 0 77.93s 8,079 327 0
gpt-oss-120b 9.8 10.0 100.0% 0 6.91s 6,514 287 1,083
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 3.0 10.0 0.0% 0 3.07s 183 20 0
gpt-oss-120b 3.0 10.0 0.0% 0 26.51s 312 3,101 3,758

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