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GPT OSS 20B vs Hy4 preview

Hy4 preview leads the LLM Stats Score 51.1 to 17.2.

OpenAI · Tencent · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 51.1 to 17.2, ranking #14 overall.

In the 1 individual benchmarks reported for both models, Hy4 preview wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT OSS 20B

  • you want predictable pricing at $0.05/M input and $0.20/M output

Choose Hy4 preview

  • overall performance matters — it scores 51.1 and ranks #14 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

GPT OSS 20B
OpenAI
Hy4 preview
Tencent
Core performance indexes
LLM Stats Score
17.2
#206
51.1
#14
Reasoning
15.8
#209
50.7
#11
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
$0.05 / M
— / M
Output price
$0.20 / M
— / M
Context window
131,072
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT OSS 20B
Hy4 preview
Math
17.4#190
39.4#17
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for GPT OSS 20B · 32 for Hy4 preview

1 shared

GPT OSS 20B outperforms in 0 benchmarks, while Hy4 preview is better at 1 benchmark (GPQA).

Hy4 preview significantly outperforms across most benchmarks.

Sat Sep 05 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Model Size

Parameter count comparison

749.1B diff

Hy4 preview has 749.1B more parameters than GPT OSS 20B, making it 3584.2% larger.

OpenAI
GPT OSS 20B
20.9Bparameters
Tencent
Hy4 preview
770.0Bparameters
20.9B
GPT OSS 20B
770.0B
Hy4 preview

Context Window

Maximum input and output token capacity

Only GPT OSS 20B specifies input context (131,072 tokens). Only GPT OSS 20B specifies output context (32,768 tokens).

OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Tencent
Hy4 preview
Input- tokens
Output- tokens
Sat Sep 05 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under Apache 2.0.

Both models share the same licensing terms, providing consistent usage rights.

GPT OSS 20B

Apache 2.0

Open weights

Hy4 preview

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT OSS 20B was released on 2025-08-05, while Hy4 preview was released on 2026-08-28.

Hy4 preview is 13 months newer than GPT OSS 20B.

GPT OSS 20B

Aug 5, 2025

1.1 years ago

Hy4 preview

Aug 28, 2026

1 weeks ago

1.1yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT OSS 20B and Hy4 preview side-by-side, then vote on the output you prefer.

GPT OSS 20B
✓ Preferred
Hy4 preview
Open in Playground

FAQ

Common questions about GPT OSS 20B vs Hy4 preview.

Which is better, GPT OSS 20B or Hy4 preview?

Hy4 preview leads the LLM Stats Score 51.1 to 17.2. GPT OSS 20B is made by OpenAI and Hy4 preview is made by Tencent. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT OSS 20B compare to Hy4 preview in benchmarks?

GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%. Hy4 preview scores GPQA: 92.3%, Terminal-Bench 2.1: 85.4%, WideSearch: 83.9%, MCP Atlas: 83.7%, SWE-bench Multilingual: 82.9%.

What are the context window sizes for GPT OSS 20B and Hy4 preview?

GPT OSS 20B supports 131K tokens and Hy4 preview supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT OSS 20B and Hy4 preview?

Key differences include LLM Stats Score (17.2 vs 51.1). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 20B and Hy4 preview?

GPT OSS 20B is developed by OpenAI and Hy4 preview is developed by Tencent.

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