GPT-6 Astra vs Grok 4.3: cost per task
Grok 4.3 is cheaper on 14 of 14 tasks and about 5.7x cheaper on average (geometric mean). GPT-6 Astra has the higher LMArena Text score (1477 vs 1442).
| Task | GPT-6 Astra | Grok 4.3 | Difference |
|---|---|---|---|
| Answer a chat question | 3.4¢ | 0.45¢ | 7.4x |
| Reply to a customer email | 0.89¢ | 0.27¢ | 3.3x |
| Write a 1,500-word blog post | 11¢ | 1.00¢ | 11.5x |
| Write 10 product descriptions | 6.2¢ | 0.43¢ | 14.2x |
| Translate 1,000 words | 8.0¢ | 1.3¢ | 6.1x |
| Proofread one page (500 words) | 4.0¢ | 0.60¢ | 6.7x |
| Summarize a 20-page PDF | 16¢ | 2.0¢ | 7.7x |
| Extract data from an invoice | 2.6¢ | 0.55¢ | 4.8x |
| Analyze a 200-row spreadsheet | 42¢ | 8.6¢ | 4.9x |
| Answer from 5 retrieved documents (RAG) | 5.9¢ | 0.89¢ | 6.6x |
| Classify 100 support tickets | 3.9¢ | 1.0¢ | 3.7x |
| Review 500 lines of code | 24¢ | 9.5¢ | 2.6x |
| Write a SQL query | 2.4¢ | 0.55¢ | 4.4x |
| Run a 50-step coding agent | $3.72 | 73¢ | 5.1x |
Specs and list prices
| GPT-6 Astra | Grok 4.3 | |
|---|---|---|
| Input per 1M | $10.00 | $1.25 |
| Output per 1M | $50.00 | $2.50 |
| Cached input per 1M | $1.00 | $0.20 |
| Context | 1.05M | 1M |
| Providers | 7 | 4 |
| Reasoning | always | default |
| LMArena Text | 1477 | 1442 |
| Released | Sep 4, 2026 | May 1, 2026 |
FAQ
Is GPT-6 Astra or Grok 4.3 cheaper?
Grok 4.3 is cheaper on 14 of 14 tasks and about 5.7x cheaper on average (geometric mean). GPT-6 Astra has the higher LMArena Text score (1477 vs 1442).
How much does GPT-6 Astra cost compared to Grok 4.3 per token?
GPT-6 Astra: $10.00 input and $50.00 output per 1M tokens. Grok 4.3: $1.25 input and $2.50 output. Token prices alone mislead - models use different numbers of tokens for the same task, which is what the task table shows.