OpenAI vs xAI (Grok) Pricing
Per-million-token pricing for OpenAI and xAI (Grok), with side-by-side flagship models, cheapest tiers, and context windows. Pricing data syncs weekly from a continuously-updated model catalog — last updated May 22, 2026.
As of May 22, 2026, OpenAI offers the lowest output-token price at $0.14/1M (gpt-oss-20b — $0.14/1M output).
Who wins on what
Cheapest input tokens
$0.03/1MOpenAI
gpt-oss-20b — $0.03/1M input
Cheapest output tokens
$0.14/1MOpenAI
gpt-oss-20b — $0.14/1M output
Longest context window
2.0MOpenAI
gpt-5.4 (>272K context length) — 2.0M input tokens
Lowest average output cost
$6.76/1MxAI (Grok)
Provider-wide average across 43 models
Largest model catalog
140 modelsOpenAI
More options to match cost vs capability
Cheapest cached input
$0.13/1MOpenAI
GPT-5.1 Codex Max — $0.13/1M cached read
Most reasoning models
11 modelsOpenAI
Models with dedicated reasoning / thinking support
Most vision models
10 modelsOpenAI
Models that accept image input
Side-by-side
OpenAI
Cheapest input
$0.030
gpt-oss-20b
Cheapest output
$0.140
gpt-oss-20b
Longest context
2.0M
gpt-5.4 (>272K context length)
Avg output / 1M
$28.06
Across catalog
Cheapest cached input
$0.125
GPT-5.1 Codex Max
| Model | In/1M | Out/1M | Ctx |
|---|---|---|---|
| GPT-5.5 Pro VisionReasoningTools | $30.00 | $180.00 | 1.1M |
| GPT-5.5 VisionReasoningToolsCache | $5.00 | $30.00 | 1.1M |
| gpt-5.4-mini | $0.750 | $4.50 | 272K |
| gpt-5.4-nano | $0.200 | $1.25 | 272K |
| GPT-5.4 Pro VisionReasoningTools | $30.00 | $180.00 | 1.1M |
| gpt-oss-20b | $0.030 | $0.140 | 131K |
xAI (Grok)
Cheapest input
$0.200
Grok 4 Fast
Cheapest output
$0.500
Grok 3 Mini
Longest context
2.0M
Grok 4 Fast
Avg output / 1M
$6.76
Across catalog
Cheapest cached input
$0.200
Grok 4.20 (Non-Reasoning)
| Model | In/1M | Out/1M | Ctx |
|---|---|---|---|
| Grok 4.3 VisionReasoningToolsCache | $1.25 | $2.50 | 1.0M |
| Grok Build 0.1 VisionReasoningToolsCache | $1.00 | $2.00 | 256K |
| Grok 4.20 (Non-Reasoning) VisionToolsCache | $1.25 | $2.50 | 2.0M |
| Grok 4.20 (Reasoning) VisionReasoningToolsCache | $1.25 | $2.50 | 2.0M |
| Grok 4.20 Multi-Agent VisionReasoningCache | $1.25 | $2.50 | 2.0M |
| Grok 3 Mini | $0.300 | $0.500 | 131K |
All prices in USD per 1 million tokens. Showing top 6 models per provider, sorted by output cost.
Related comparisons
Run the numbers for your workload
Calcaas multiplies per-token costs by your real usage patterns — inputs, outputs, retries, and conversation history — across both providers in one model.