API cost decision in 10 seconds

NewGrok Build 0.1 vs GPT-5.5 Pro

Pick Grok Build 0.1 for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T13:08:02Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Grok Build 0.1 for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Grok Build 0.1 is estimated at $2 vs $120 for GPT-5.5 Pro, saving $118 (98.3% lower).

Cost-first pickGrok Build 0.1

Context-first pickGPT-5.5 Pro

Sample savings$11898.3%

10x traffic gap$1180

GPT-5.5 Pro has more context, but Grok Build 0.1 saves $118 on the standard workload. At 10x that traffic, the same price gap is about $1180. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Grok Build 0.1 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Grok Build 0.1	GPT-5.5 Pro
Input-heavy / RAG	5M input + 500K output	Grok Build 0.1	$6	$240
Balanced workload	1M input + 1M output	Grok Build 0.1	$3	$210
Output-heavy chatbot	1M input + 5M output	Grok Build 0.1	$11	$930

Cheaper input Grok Build 0.1 $1 vs $30 / 1M

Grok Build 0.1 is $29 cheaper per 1M input tokens (96.7% lower; 30x difference).

Cheaper output Grok Build 0.1 $2 vs $180 / 1M

Grok Build 0.1 is $178 cheaper per 1M output tokens (98.9% lower; 90x difference).

Larger context GPT-5.5 Pro 256K vs 1.05M

GPT-5.5 Pro has 794K more context (4.1x larger).

Sample workload Grok Build 0.1 $2 vs $120

Grok Build 0.1 is $118 cheaper on the standard workload (98.3% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Grok Build 0.1 Calculating… Estimated API cost

GPT-5.5 Pro Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Grok Build 0.1 has the lower input price; Grok Build 0.1 has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Grok Build 0.1 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2 for Grok Build 0.1 and $120 for GPT-5.5 Pro.

Best Fit

Choose Grok Build 0.1 when you care most about lower input-token price, and lower output-token price.

Choose GPT-5.5 Pro when you care most about larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Grok Build 0.1 is estimated at $2 vs $120 for GPT-5.5 Pro, saving $118 (98.3% lower).
Grok Build 0.1 is $118 cheaper on the standard workload (98.3% lower).
Grok Build 0.1 is $29 cheaper per 1M input tokens (96.7% lower; 30x difference).
Grok Build 0.1 is $178 cheaper per 1M output tokens (98.9% lower; 90x difference).
GPT-5.5 Pro has 794K more context (4.1x larger).

Head-to-Head Specs

Feature	NewGrok Build 0.1 (xAI)	GPT-5.5 Pro (OpenAI)
Input Price prompt tokens per 1M	$1	$30
Completion Price per 1M tokens	$2	$180
Sample Workload Cost 1M input + 500K output	$2	$120
Context Window	256K	1.05M
Release Date	2026-05-20	2026-04-24

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Grok Build 0.1	On the standard 1M input plus 500K output workload, Grok Build 0.1 is estimated at $2 vs $120 for GPT-5.5 Pro, saving $118 (98.3% lower).
High-volume input processing	Grok Build 0.1	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Grok Build 0.1	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.5 Pro	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

gpt-oss-120b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.13.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.

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