| Signal | gpt-oss-20b | Delta | Grok 4 Fast |
|---|---|---|---|
Capabilities | 67 | -33 | |
Benchmarks | 56 | -14 | |
Pricing | 0 | 0 | |
Context window size | 81 | -19 | |
Recency | 91 | -8 | |
Output Capacity | 85 | +11 | |
| Overall Result | 1 wins | of 6 | 5 wins |
0
days ranked higher
0
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OpenAI
xAI
gpt-oss-20b saves you $36.50/month
That's $438.00/year compared to Grok 4 Fast at your current usage level of 100K calls/month.
| Metric | gpt-oss-20b | Grok 4 Fast | Winner |
|---|---|---|---|
| Overall Score | 69 | 83 | Grok 4 Fast |
| Rank | #164 | #52 | Grok 4 Fast |
| Quality Rank | #164 | #52 | Grok 4 Fast |
| Adoption Rank | #164 | #52 | Grok 4 Fast |
| Parameters | 20B | -- | -- |
| Context Window | 131K | 2000K | Grok 4 Fast |
| Pricing | $0.03/$0.11/M | $0.20/$0.50/M | -- |
| Signal Scores | |||
| Capabilities | 67 | 100 | Grok 4 Fast |
| Benchmarks | 56 | 70 | Grok 4 Fast |
| Pricing | 0 | 1 | Grok 4 Fast |
| Context window size | 81 | 100 | Grok 4 Fast |
| Recency | 91 | 99 | Grok 4 Fast |
| Output Capacity | 85 | 75 | gpt-oss-20b |
Our composite score (0–100) combines six weighted signals: benchmark performance (25%), pricing efficiency (25%), context window size (15%), model recency (15%), output capacity (10%), and capability versatility (10%). Here's what the scores mean for these two models:
Scores 69/100 (rank #164), placing it in the top 44% of all 290 models tracked.
Scores 83/100 (rank #52), placing it in the top 82% of all 290 models tracked.
Grok 4 Fast has a 15-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
gpt-oss-20b offers 80% better value per quality point. At 1M tokens/day, you'd spend $2.10/month with gpt-oss-20b vs $10.50/month with Grok 4 Fast - a $8.40 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Higher benchmark score (0/100) indicates stronger performance on coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Faster response time (speed score 0/100) is critical for user-facing chat. gpt-oss-20b also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (2000K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($0.11/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (83/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
Grok 4 Fast clearly outperforms gpt-oss-20b with a significant 14.900000000000006-point lead. For most general use cases, Grok 4 Fast is the stronger choice. However, gpt-oss-20b may still excel in niche scenarios.
Best for Quality
gpt-oss-20b
Marginally better benchmark scores; both are excellent
Best for Cost
gpt-oss-20b
80% lower pricing; better value at scale
Best for Reliability
gpt-oss-20b
Higher uptime and faster response speeds
Best for Prototyping
gpt-oss-20b
Stronger community support and better developer experience
Best for Production
gpt-oss-20b
Wider enterprise adoption and proven at scale
by OpenAI
| Capability | gpt-oss-20b | Grok 4 Fast |
|---|---|---|
| Vision (Image Input)differs | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
OpenAI
xAI
gpt-oss-20b saves you $0.7740/month
That's 81% cheaper than Grok 4 Fast at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | gpt-oss-20b | Grok 4 Fast |
|---|---|---|
| Context Window | 131K | 2M |
| Max Output Tokens | 131,072 | 30,000 |
| Open Source | Yes | No |
| Created | Aug 5, 2025 | Sep 19, 2025 |
Grok 4 Fast scores 83/100 (rank #52) compared to gpt-oss-20b's 69/100 (rank #164), giving it a 15-point advantage. Grok 4 Fast is the stronger overall choice, though gpt-oss-20b may excel in specific areas like cost efficiency.
gpt-oss-20b is ranked #164 and Grok 4 Fast is ranked #52 out of 290+ AI models. Rankings use a composite score combining benchmark performance (25%), pricing (25%), context window (15%), recency (15%), output capacity (10%), and versatility (10%). Scores update hourly.
gpt-oss-20b is cheaper at $0.11/M output tokens vs Grok 4 Fast's $0.50/M output tokens - 4.5x more expensive. Input token pricing: gpt-oss-20b at $0.03/M vs Grok 4 Fast at $0.20/M.
Grok 4 Fast has a larger context window of 2,000,000 tokens compared to gpt-oss-20b's 131,072 tokens. A larger context window means the model can process longer documents and conversations.