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Model comparison · Updated 17 Aug 2026

GPT-5.1 vs Grok Build 0.1

Grok Build 0.1 is about 1.3× cheaper on input ($1.00 against $1.25 per 1M tokens) and on output. GPT-5.1 has the larger context window (400K against 256K tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,463 a month for GPT-5.1 and $630 for Grok Build 0.1.

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ModelsAtlas. “GPT-5.1 vs Grok Build 0.1”. Retrieved 17 Aug 2026. https://modelsatlas.com/compare/openai/gpt-5-1/vs/xai/grok-build-0-1

Model A

GPT-5.1

by OpenAI · weights not marked open · GRIDE4

Input / 1M
$1.25
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$10.00
Context400K
vs

Model B

Grok Build 0.1

by xAI · weights not marked open · GRIDE3

Input / 1M
$1.00
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$2.00
Context256K

Key numbers

Standard tier · highlighted = better

GPT-5.1
Grok Build 0.1
Input / 1M tokens
$1.25
$1.00
Output / 1M tokens
$10.00
$2.00
Batch input / output
$0.63 / $5.00
Not listed
Context window
400,000
256,000
Input types
Not disclosed
Not disclosed
Weights
Not marked open
Not marked open
Tiers listed
batch, standard
standard
Prices checked
2026-08-17
2026-08-17

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out
$1,463/mo
$630/mo
RAG over documents2k queries/day · 12k in, 500 out
$1,200/mo
$780/mo
Coding agent300 tasks/day · 60k in, 8k out
$1,395/mo
$684/mo

GPT-5.1   Grok Build 0.1 · Derived from the standard-tier prices above, input and output tokens per request as stated, 30 days. Excludes caching discounts and batch. Try your own numbers.

On the atlas

Price band (A–H) × context band (1–6)

1 square apart. Grok Build 0.1 (E3) sits 1 context band smaller than GPT-5.1 (E4).

Same square as GPT-5.1: GPT-5 ($1.25), GPT-5.1-Codex ($1.25), Mistral Medium 3.5 ($1.50). Same square as Grok Build 0.1: Claude Haiku 4.5 ($1.00), Nano Banana Pro (Gemini 3 Pro Image) ($2.00), o3 ($2.00). Open E4 · Open E3

AFreeB<$0.10C$0.10–0.30D$0.30–1E$1–3F$3–10G$10–30H$30+1<32K232–128K3128–256K4256K–1M51M6>1MINPUT PRICE PER 1M TOKENS →CONTEXT WINDOW ↑ · position within a square follows the real valueGPT-5 · E4GPT-5.1-Codex · E4Mistral Medium 3.5 · E4GPT-5.2 · E4GPT-5.2-Codex · E4GPT-5.3-Codex · E4Claude Haiku 4.5 · E3Nano Banana Pro (Gemini 3 Pro Image) · E3o3 · E3Command A · E3GPT-5.1GPT-5.1Grok Build 0.1Grok Build 0.1
GPT-5.1Grok Build 0.1Nearest neighboursOpen weights
View the map as a table (2 squares)
SquarePrice bandContext bandModels
GRIDE3$1–3128–256KGrok Build 0.1, Claude Haiku 4.5, Nano Banana Pro (Gemini 3 Pro Image), o3, Command A
GRIDE4$1–3256K–1MGPT-5.1, GPT-5, GPT-5.1-Codex, Mistral Medium 3.5, GPT-5.2, GPT-5.2-Codex, GPT-5.3-Codex

Capabilities side by side

Only what our records list

GPT-5.1
Grok Build 0.1
Vision input
Not disclosed
Not disclosed
Audio input
Not disclosed
Not disclosed
Open weights
Not marked open
Not marked open
Batch tier
Supported
Not listed
Free tier
Not listed
Not listed
Thinking tier
Not listed
Not listed

Neither record lists input types, so we do not claim any.

Which should you choose?

Editorial

Choose GPT-5.1 if…

  • your prompts are long: it takes 400,000 tokens against 256,000
  • work can wait: it lists a batch tier and the other does not

Choose Grok Build 0.1 if…

  • you pay by the token: it costs $1.00 per 1M input against $1.25
  • output dominates your bill: $2.00 per 1M output against $10.00

Each reason is a fact from the tables above. Picking between them is our judgement, and we do not benchmark quality: price and context are what we can measure, so test both on your own prompts before you commit.

Questions

Is GPT-5.1 better than Grok Build 0.1?
We do not benchmark quality, so we cannot say. On the recorded numbers: Grok Build 0.1 is about 1.3× cheaper on input ($1.00 against $1.25 per 1M tokens) and on output. GPT-5.1 has the larger context window (400K against 256K tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,463 a month for GPT-5.1 and $630 for Grok Build 0.1. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, GPT-5.1 or Grok Build 0.1?
Grok Build 0.1: $1.00 against $1.25 per 1M input tokens, and $2.00 against $10.00 per 1M output, on standard pricing.
How much does each cost per 1M tokens?
GPT-5.1: $1.25 input and $10.00 output. Grok Build 0.1: $1.00 input and $2.00 output. Standard tier, USD.
Which has the larger context window?
GPT-5.1, with 400,000 tokens. Grok Build 0.1 has 256,000 tokens.
Do both offer batch pricing?
GPT-5.1 lists a batch tier, at 50% of its standard price. Grok Build 0.1 lists no batch tier.
Can both read images or audio?
Input types recorded for GPT-5.1: none recorded. For Grok Build 0.1: none recorded. Where a record lists none we say so rather than guess; check each vendor's documentation before relying on a capability.
Is either model open-weight?
GPT-5.1: not marked open-weight in our records. Grok Build 0.1: not marked open-weight in our records.
What would each cost for a support chatbot?
At 10,000 chats a day, 1,500 input and 300 output tokens each, 30 days, standard tier: about $1,463 a month for GPT-5.1 and $630 for Grok Build 0.1. This is our calculation from the listed prices, not a quote.

About the two models

GPT-5.1

By OpenAI. $1.25 input and $10.00 output per 1M tokens, 400K context, atlas square E4. Tiers listed: batch, standard.

Full specs & pricing →

Grok Build 0.1

By xAI. $1.00 input and $2.00 output per 1M tokens, 256K context, atlas square E3. Tiers listed: standard.

Full specs & pricing →

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