head-to-head

SpaceXAI: Grok 4.3 vs OpenAI: GPT-5.4 Nano

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

SpaceXAI: Grok 4.3 OpenAI: GPT-5.4 Nano
Vendorx-aiopenai
Quality Score100100
Benchmark Score39.331.5
Input Price$1.25/M$0.20/M
Output Price$2.50/M$1.25/M
Context Window1,000,000400,000
Max Output900,000128,000
Tool Calling
Structured Output
Reasoning Mode
Vision
Audio--
Benchmark Scores
ai_index41.134.2

Who wins by task?

TaskSpaceXAI: Grok 4.3OpenAI: GPT-5.4 Nano
SQL Generation 138 138
Code Review 139 138
Code Completion 120 132
Code Refactoring 142 141
Bug Fixing 143 142
Unit Test Generation 128 128
Code Documentation 134 134
Regex Writing 123 123
CI/CD Pipelines 124 124
Frontend Component Design 126 126
Data Analysis 130 129
CSV / Spreadsheet Cleanup 135 135
ETL Scripting 133 132
JSON Extraction 123 131
Bulk Data Labeling 120 129
OCR / Document Parsing 133 132
Table Extraction from PDFs 133 132
Long-Document Summarization 144 143
Short-Form Summarization 117 125
Blog Post Writing 126 126

Scores reflect capability match + benchmark data + pricing for each task. Methodology →

Related comparisons

Anthropic: Claude Haiku Latest vs OpenAI: GPT-5.4 Nano Anthropic: Claude Opus 5 (batch) vs SpaceXAI: Grok 4.3 Anthropic: Claude Sonnet 5 (batch) vs SpaceXAI: Grok 4.3 Anthropic: Claude Sonnet 5 vs OpenAI: GPT-5.4 Nano Anthropic: Claude Sonnet 5 vs SpaceXAI: Grok 4.3 Anthropic: Claude Sonnet Latest vs OpenAI: GPT-5.4 Nano Google: Gemini 3.1 Flash Lite vs OpenAI: GPT-5.4 Nano Google: Gemini 3.1 Flash Lite vs SpaceXAI: Grok 4.3

The Model Movers Report

One email every Friday, built from this site's own rankings: the current top five by benchmark score, every model released in the last seven days, and one note worked out from that week's numbers. You can unsubscribe from any issue with one click.