xAI / manual · models.dev

Grok 4.6

xAI's frontier model for long-running agents, coding, knowledge work, and visual projects

Encoding fertility 1.22×

Harnesses

Same model, different drivers. ChatGPT is not OpenCode. $ / MU is only set when every official task passed. $ / pass still shows on a partial run; it does not rank. Time is output tokens at 80 tok/s, not wall clock.

Stack	Passed	Attempts	Time	$ / MU	$ / pass	$ / hr	Tokens / pass	Burn	$ / xAI
Grokhigh	3/3	4	17m 43s	$0.000450	$0.6447	$5.21	129,612	1.14×	$0.6447
Grokmedium	3/3	5	16m 32s	$0.000385	$0.5504	$4.83	114,015	1.00×	$0.5504

Official jobs

Pass or fail on each sealed job. Attempts include retries. Failed tries stay in the bill.

Harness	Durable work queue 2/2	JSON Patch (RFC 6902 subset) 1/1	Token bucket and sliding window 1/1
Grok · high	pass · 2	pass · 1	pass · 1
Grok · medium	pass · 2	—	—

Tokens by job

Billed tokens on each official job, including retries. Cache reads drop out of this count.

Grok · high
230,145Durable work queue
40,558JSON Patch (RFC 6902 subset)
118,134Token bucket and sliding window
Grok · medium
205,475Durable work queue
—JSON Patch (RFC 6902 subset)
—Token bucket and sliding window

Where the bill goes

Failed attempts stay in the bill. Cache hits are a discount, shown separately.

Grok · high388,837
Cache hit 1,632,128 (discount, not extra work)
Grok · medium342,046
Cache hit 1,299,456 (discount, not extra work)

Uncached in
Output
Thinking
Cache write

Retry tax

Attempts are harness calls, including failed hidden-verifier retries. Extra tries stay in the bill.

Grokhigh4 attempts · 1 extra / 3 jobs
Grokmedium5 attempts · 2 extra / 3 jobs

Cache hits

Hits divided by uncached input plus hits. No cache means the harness did not report a discount.

Grokhigh84%
Grokmedium83%

Time vs $ / MU

Decode time at 80 tok/s against what that finish cost. A long token bill is not the same as an expensive one.

Encoding by slice

Native tokens per MU on the same frozen basket. Tool schemas are where fertility often doubles.

English prose30% of the basket0.97×
Code25% of the basket1.08×
Structured15% of the basket0.87×
Tool schemas10% of the basket1.11×
CJK10% of the basket3.33×
Instructions10% of the basket0.88×

Slice	Characters	Native tokens	Fertility	True in	Source
English prose	4,474	1,088	0.97×	$1.95	official
Code	2,321	629	1.08×	$2.17	official
Structured	3,067	664	0.87×	$1.73	official
Tool schemas	2,378	662	1.11×	$2.23	official
CJK	831	691	3.33×	$6.65	official
Instructions	1,164	255	0.88×	$1.75	official

Endpoints

Provider	SKU	List in	List out	Cache hit	Cache write
xAI	`grok-4.6`	$2.00	$6.00	$0.50	$2.00

All stacks