GPT-5 nano vs GPT-OSS 20B
Change modelsGPT-5 nanoOpenAI
GPT-OSS 20BOpenAI
IndexAll categories, out of 100.
41.9 ±6.2 best
41.7 ±4.6
GapIndex points below the top.
Top
−0.2 · no clear gap
CoverageIndex weight that has results.
75%
90% best
SpeedOutput tokens per second.
81/s
310/s best
EloLMArena rating and rank.
1320 best
1288
ReleasedMonth of release.
2025-08
2025-08
Input / 1MUS dollars per 1M input tokens.
$0.05
$0.03 best
Output / 1MUS dollars per 1M output tokens.
$0.40
$0.13 best
Batch output / 1MBatch price per 1M output tokens.
$0.20
—
1K chats2K tokens in, 500 out, each.
$0.30
$0.125 best
1K documents20K tokens in, 1K out, each.
$1.40
$0.73 best
1K agent tasks200K tokens in, 20K out, each.
$18.00
$8.60 best
ContextMaximum tokens in one request.
400K best
131K
AgenticMulti-step tasks with tools.
—
39.8
CodingCode writing and repair.
37.2
48.9 best
ReasoningLogic problems and puzzles.
42.6 best
35.3
MultimodalTasks with images and text.
47.5
—
KnowledgeFacts and expert knowledge.
37.4 best
36.0
MultilingualTasks in many languages.
44.5 best
37.0
InstructionTasks with strict prompt rules.
—
49.9
MathMath problems.
45.8
45.9 best
Benchmarks
20 sharedOnly GPT-5 nano: 20Only GPT-OSS 20B: 17
GPT-5 nano
GPT-OSS 20B