VERIFIED PRICEREASONING SNAPSHOT1MTEXT MODELPROMPT CACHING
Grok 4.20 (0309) Reasoning API Pricing
Grok 4.20 0309 Reasoning is a dated xAI reasoning snapshot at $1.25/$2.50. $1.25/M input, $2.5/M output, and $0.2/M cached input. It is useful for comparing Grok dated variants against the current Grok 4.3 line.
Input - per 1M tokens
$1.25/M
Source xAI active
Output - per 1M tokens
$2.50/M
Use for cost checks active
Cached input
$0.20/M
Cache hit price discounted
Effective - agentic blend
$0.56/M
92/8 split - 82% cache
§ 01 / TERMINAL
Run the numbers.
Calculator pre-loaded with Grok 4.20 (0309) Reasoning rates. Tweak spend, output mix, or cache hit rate to compare this model with current alternatives.
$ /mo
Workload split
Prompt cache hit rate
Tokens you can process
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Words equivalent (English)
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Effective rate
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§ 02 / SCENARIOS
Real-world presets.
AGENT LOOP
Repo-wide bug fix
$0.049/task
LONG DOC
Reading 100-page contracts
$0.088/doc
RAG SUPPORT
Support agent ticket triage
$0.004/ticket
ASSISTANT TURN
Research planning turn
$0.010/turn
§ 03 / TAPE
Price history.
Input · $1.3/M
Output · $2.5/M
Cached · $0.20/M
MAR 09 Dated reasoning snapshot at $1.25/M input, $0.20/M cached input, and $2.50/M outputMAY 18 Active dated Grok 4.20 variant verified on xAI model docs
§ 04 / TOKENIZER
Paste text. See tokens. See cost.
Estimate · grok-tokenizer-estimate · ≈4.2 chars/token Auto-counts as you type
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
Characters —
Words —
Tokens (estimated) —
Cost as input · uncached —
Cost as output · uncached —
Cost as cached input —
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Grok 4.20 (0309) Reasoning | $1.25 cache $0.20 | $2.50 | $0.56 current page | 1M | Grok long-context agents |
| Grok 4.3 | $1.25 cache $0.20 | $2.50 | $0.56 same blend | 1M | Grok long-context agents |
| Grok 4 | $3.00 cache $0.75 | $15.00 | $2.26 pricier | 256K | Grok long-context agents |
| Grok 4 Fast | $0.20 cache $0.05 | $0.50 | $0.11 cheaper | 2M | Grok long-context agents |
| GPT-5.4 | $2.50 cache $0.25 | $15.00 | $1.80 pricier | 1.05M | Current OpenAI replacement |
| Claude Sonnet 4.6 | $3.00 cache $0.30 | $15.00 | $1.92 pricier | 1M | Current Claude agents |
| Gemini 2.5 Pro | $1.25 cache $0.13 | $10.00 | $1.10 pricier | 2M | Gemini multimodal workloads |
Frequently asked.
Short answers for teams checking Grok 4.20 (0309) Reasoning pricing, status, and migration choices.
Q · 01 Is Grok 4.20 (0309) Reasoning still available? +
Grok 4.20 (0309) Reasoning is listed as active in the current snapshot and was checked against the vendor model/pricing page.
Q · 02 How much does Grok 4.20 (0309) Reasoning cost? +
Grok 4.20 (0309) Reasoning is listed at $1.25/M input and $2.5/M output.
Q · 03 Is cached-input pricing included? +
Yes. Cached input is shown at $0.2/M.
Q · 04 What should teams compare it against? +
Use the shelf to compare current replacements and nearby models. Snapshot replacement:
current same-provider models.Q · 05 Why keep this page? +
These pages preserve price history, preview economics, and migration context without pretending every older or preview model is the best current default.