Grok 4.3: The Budget-Friendly Option
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Lesson updated November 3, 2026 based on xAI’s Models page: this comparison covers grok-4.7, the model recommended since September 2026, at the same base rates as grok-4.5. Sources: Models · Release notes.
Best Value in the Lineup
grok-4.3 is the budget-friendly alternative to the high-end models (grok-4.7, grok-4.6, grok-4.5). It delivers solid performance at a significantly lower price, plus the largest context window in the lineup: 1 million tokens, compared to 500,000 for grok-4.5. For many use cases, it’s the most relevant model in the range.
Why Choose grok-4.3?
This model’s positioning is clear: it targets production applications where query volume makes unit cost decisive. Where grok-4.7 charges $2.00 per million input tokens and $6.00 for output (under 200k context), grok-4.3 costs $1.25 for input and $2.50 for output — making output costs less than half.
This price difference doesn’t mean an equivalent difference in quality. On common tasks — summarization, classification, extraction, assisted writing — grok-4.3 produces perfectly satisfactory results. The gap becomes apparent on complex reasoning tasks and multi-step problems compared to grok-4.5 and its configurable reasoning.
What About the Reasoning / Non-Reasoning Variants?
Unlike the high-end models (grok-4.5 to grok-4.7), where reasoning effort is set via parameter, the 4.20 generation remains in the catalog with distinct variants, at exactly the same price as grok-4.3:
grok-4.20-0309-reasoning
This variant engages in internal reasoning before answering. It is suited for technical questions, logic problems, and analyses that require structured thinking — while remaining significantly more affordable than grok-4.5.
grok-4.20-0309-non-reasoning
The direct variant, without a reasoning phase. This is a solid choice for applications where latency is paramount: chatbots, writing assistants, data processing pipelines, entity extraction.
If you’re starting a new project, compare grok-4.3 and these 4.20 variants: same price, same 1 million token context — the choice comes down to quality measured on your tasks.
Pricing Comparison
| Feature | grok-4.5 | grok-4.3 |
|---|---|---|
| Input ($/M tokens, < 200k) | $2.00 | $1.25 |
| Cached Input ($/M tokens, < 200k) | $0.30 | $0.20 |
| Output ($/M tokens, < 200k) | $6.00 | $2.50 |
| Beyond 200k (I/O) | $4.00 / $12.00 | $2.50 / $5.00 |
| Context | 500k tokens | 1M tokens |
Ideal Use Cases
grok-4.3 excels in the following scenarios:
- Chatbots and assistants — controlled cost, smooth responses for conversational interactions
- Data pipelines — classification, entity extraction, tagging at scale
- Document summarization — the 1 million token window absorbs entire corpora within a controlled budget
- Prototyping — test ideas quickly before switching to grok-4.5 for the final version
- High-traffic applications — when query volume demands a low unit cost
When to Prefer grok-4.5
Some tasks justify the extra cost of grok-4.5:
- Complex math or logic problems requiring deep reasoning
- Code analysis on large codebases with subtle interdependencies
- Open-ended questions needing nuanced, multi-faceted reasoning
- Tasks where configurable reasoning allows fine-tuning the quality/latency trade-off
The right strategy often involves using grok-4.3 by default and routing complex queries to grok-4.5 when quality demands it.
Production Performance
Watch out for the pricing tier: as soon as your request exceeds 200,000 tokens of context, prices double ($2.50 for input, $5.00 for output). Monitor the cumulative size of your conversations and documents to stay under the threshold where possible.
Rate limits (requests and tokens per minute) depend on your account tier: check the xAI console for your exact values. If exceeded, the API returns an HTTP 429 code — make sure to implement exponential backoff in your clients.
Prices as of August 5, 2026 — prices change regularly: before budgeting, check the current rate card on the official xAI models and pricing page.
Key Takeaways
- grok-4.3 costs $1.25 / $2.50 per million tokens (input / output) under 200k context, vs $2.00 / $6.00 for grok-4.5
- Its 1 million token window is the largest in the lineup, ahead of grok-4.5’s 500k
- grok-4.20-0309 variants (reasoning and non-reasoning) remain in the catalog at the same price as grok-4.3
- Beyond 200k tokens context, all prices double — watch this threshold
- Input cache further reduces costs: $0.20 per million cached tokens
- Use grok-4.3 by default and route to grok-4.5 only for complex tasks