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Model comparison · Updated 2 Nov 2026

GPT-6.1 Terra vs Grok 4.20 Multi-Agent

GPT-6.1 Terra is about 1.3× cheaper on input ($1.00 against $1.25 per 1M tokens), though Grok 4.20 Multi-Agent is cheaper on output. Grok 4.20 Multi-Agent has the larger context window (2M against 1.05M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $900 a month for GPT-6.1 Terra and $788 for Grok 4.20 Multi-Agent.

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ModelsAtlas. “GPT-6.1 Terra vs Grok 4.20 Multi-Agent”. Retrieved 2 Nov 2026. https://modelsatlas.com/compare/openai/gpt-6-1-terra/vs/xai/grok-4-20-multi-agent

Model A

GPT-6.1 Terra

by OpenAI · weights not marked open · GRIDE6

Input / 1M
$1.00
observed We measured
Source
Our catalogue
Retrieved
2 Nov 2026
Output / 1M$5.00
Context1.05M
vs

Model B

Grok 4.20 Multi-Agent

by xAI · weights not marked open · GRIDE6

Input / 1M
$1.25
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$2.50
Context2M

Key numbers

Standard tier · highlighted = better

GPT-6.1 Terra
Grok 4.20 Multi-Agent
Input / 1M tokens
$1.00
$1.25
Output / 1M tokens
$5.00
$2.50
Batch input / output
$0.50 / $2.50
Not listed
Context window
1,050,000
2,000,000
Input types
Not disclosed
Not disclosed
Weights
Not marked open
Not marked open
Tiers listed
batch, standard
standard
Prices checked
2026-11-02
2026-08-17

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out
$900/mo
$788/mo
RAG over documents2k queries/day · 12k in, 500 out
$870/mo
$975/mo
Coding agent300 tasks/day · 60k in, 8k out
$900/mo
$855/mo

GPT-6.1 Terra   Grok 4.20 Multi-Agent · 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)

Same square. GPT-6.1 Terra and Grok 4.20 Multi-Agent share E6.

Same square as GPT-6.1 Terra: Grok 4.20 ($1.25), GPT-5.6 Terra ($2.00), GPT-6 Sol ($2.00). Open E6

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 valueGrok 4.20 · E6GPT-5.6 Terra · E6GPT-6.1 Sol · E6GPT-6 Sol · E6GPT-5.4 · E6GPT-6.1 TerraGPT-6.1 TerraGrok 4.20 Multi-AgentGrok 4.20 Multi-Agent
GPT-6.1 TerraGrok 4.20 Multi-AgentNearest neighboursOpen weights
View the map as a table (1 squares)
SquarePrice bandContext bandModels
GRIDE6$1–3>1MGPT-6.1 Terra, Grok 4.20 Multi-Agent, Grok 4.20, GPT-5.6 Terra, GPT-6.1 Sol, GPT-6 Sol, GPT-5.4

Capabilities side by side

Only what our records list

GPT-6.1 Terra
Grok 4.20 Multi-Agent
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-6.1 Terra if…

  • you pay by the token: it costs $1.00 per 1M input against $1.25
  • work can wait: it lists a batch tier and the other does not

Choose Grok 4.20 Multi-Agent if…

  • output dominates your bill: $2.50 per 1M output against $5.00
  • your prompts are long: it takes 2,000,000 tokens against 1,050,000

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-6.1 Terra better than Grok 4.20 Multi-Agent?
We do not benchmark quality, so we cannot say. On the recorded numbers: GPT-6.1 Terra is about 1.3× cheaper on input ($1.00 against $1.25 per 1M tokens), though Grok 4.20 Multi-Agent is cheaper on output. Grok 4.20 Multi-Agent has the larger context window (2M against 1.05M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $900 a month for GPT-6.1 Terra and $788 for Grok 4.20 Multi-Agent. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, GPT-6.1 Terra or Grok 4.20 Multi-Agent?
GPT-6.1 Terra: $1.00 against $1.25 per 1M input tokens, and $5.00 against $2.50 per 1M output, on standard pricing.
How much does each cost per 1M tokens?
GPT-6.1 Terra: $1.00 input and $5.00 output. Grok 4.20 Multi-Agent: $1.25 input and $2.50 output. Standard tier, USD.
Which has the larger context window?
Grok 4.20 Multi-Agent, with 2,000,000 tokens. GPT-6.1 Terra has 1,050,000 tokens.
Do both offer batch pricing?
GPT-6.1 Terra lists a batch tier, at 50% of its standard price. Grok 4.20 Multi-Agent lists no batch tier.
Can both read images or audio?
Input types recorded for GPT-6.1 Terra: none recorded. For Grok 4.20 Multi-Agent: 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-6.1 Terra: not marked open-weight in our records. Grok 4.20 Multi-Agent: 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 $900 a month for GPT-6.1 Terra and $788 for Grok 4.20 Multi-Agent. This is our calculation from the listed prices, not a quote.

About the two models

GPT-6.1 Terra

By OpenAI. $1.00 input and $5.00 output per 1M tokens, 1.05M context, atlas square E6. Tiers listed: batch, standard.

Full specs & pricing →

Grok 4.20 Multi-Agent

By xAI. $1.25 input and $2.50 output per 1M tokens, 2M context, atlas square E6. Tiers listed: standard.

Full specs & pricing →

Compare GPT-6.1 Terra with…

Compare Grok 4.20 Multi-Agent with…

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