gpt-oss-120b vs Grok 4.3 (Comparative Analysis)
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Comparative Analysis: gpt-oss-120b vs. Grok 4.3
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Overview
gpt-oss-120b was released 8 months before Grok 4.3.
 gpt-oss-120b |  Grok 4.3 | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | XAI |
Input Context Window Maximum input tokens this model can process at once | 131.1K tokens | 1M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 131.1K tokens | Not specified tokens |
Release Date When this model first became publicly available | August 5, 2025 11 months ago August 5th, 2025 | April 30, 2026 2 months ago April 30th, 2026 |
Knowledge Cutoff Latest training-data date reported by the provider | June 30, 2024 | Not reported |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
gpt-oss-120b | Grok 4.3 | |
|---|---|---|
Input Types Supported input formats | 📝Text | 📝Text🖼️Image📁File |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, LowDefault: Medium | Enabled by defaultEffort: High, Medium, Low, NoneDefault: Low |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | Grok |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Open Source Model availability | Available on HuggingFace → | Proprietary |
Pricing
gpt-oss-120b is roughly 0.03x less expensive compared to Grok 4.3 for input tokens and roughly 0.07x less expensive for output tokens.
| gpt-oss-120b | Grok 4.3 | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $0.04 per million tokens | $1.25 per million tokens |
Output Token Cost Cost per million output tokens | $0.17 per million tokens | $2.50 per million tokens |
Web Search Cost Additional cost for each web search operation | Not specified | $0.005 per search |
Cache Read Cost Cost to reuse cached input tokens | Not specified | $0.20 per million tokens |
Long Context Pricing Rates for prompts with 200,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | Not specified | $2.50 per million tokens |
Output Token Cost Long-context output cost per million tokens | Not specified | $5.00 per million tokens |
Cache Read Cost Long-context cache read cost per million tokens | Not specified | $0.40 per million tokens |
Benchmarks
Compare relevant benchmarks between gpt-oss-120b and Grok 4.3.
| gpt-oss-120b | Grok 4.3 | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 23.8 (Artificial Analysis index; higher is better) | 37.6 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | 30.4 (Artificial Analysis index; higher is better) | 42.2 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | 13.2 (Artificial Analysis index; higher is better) | 24.1 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,052 Elo (#90 in Game Dev (40.6% win rate)) | 1,235 Elo (#38 in Game Dev (49.5% win rate)) |
At a Glance
Quick overview of what makes gpt-oss-120b and Grok 4.3 unique.
gpt-oss-120b by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 131.1K token context window. Very affordable at $0.04/M input and $0.17/M output tokens. Released August 5th, 2025.Grok 4.3 by XAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $1.25/M input and $2.50/M output tokens. Released April 30th, 2026.Explore More Comparisons
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