Compare / GPT-5.3-Codex vs GPT-6 Sol

GPT-5.3-Codex vs GPT-6 Sol

Which is cheaper, which is more capable, and which does better at each kind of work, from 4 results on 2 sources that measured both models.

OpenAIGPT-5.3-Codex Released 5 Feb 2026 · $1.75 in · $14.00 out

OpenAIGPT-6 Sol Released 22 Sep 2026 · $2.00 in · $10.00 out

GPT-5.3-Codex wins 0GPT-6 Sol wins 4

Of the 4 results both models have, the better value on each. Results whose reported ranges overlap are too close to call.

Results as of 10 November 2026 (catalogue release 2026-11-10-8342a7178929).

GPT-5.3-Codex or GPT-6 Sol? The short answer

Pick GPT-6 Sol: it scores higher (Intelligence Index 47.6 against 32.5) at about the same price.

They cost about the same: $4.81 and $4.00 per million tokens (three input to one output).
GPT-6 Sol scores higher on the Artificial Analysis Intelligence Index: 47.6 against 32.5.
GPT-6 Sol is newer: released 22 Sep 2026, against 5 Feb 2026 for GPT-5.3-Codex.
On third-party benchmarks, on the results both models have: GPT-6 Sol does better for agents and tool use and reasoning and knowledge.

Head to head

32.5

Intelligence Index

47.6

$4.81

Price per million tokens, blendedlower is better

$4.00

400,000

Context window, tokens

1,050,000

Every fact side by side

	GPT-5.3-Codex	GPT-6 Sol
Price per million tokens	$1.75 in · $14.00 out	$2.00 in · $10.00 out
Blended (3 in : 1 out)	$4.81	$4.00
Cheapest host, blended	$4.81 (Azure)	$4.00 (Amazon Bedrock)
Cached input, per million	–	$0.20 cached input
Intelligence Index	32.5	47.6
Spring Prompt overall	–	67
Output speed, tokens a second	119	–
Context window	400,000 tokens	1,050,000 tokens
Released	5 Feb 2026	22 Sep 2026 (newer)
Weights	Closed	Closed
Developer based in	the US	the US

Prices are the developer's list price where we have read it, otherwise the typical host on OpenRouter; see every model's price. Intelligence and speed from Artificial Analysis.

Which is better for what

Each model's rank among the models on sale today, for each kind of work, from our own benchmarks and licensed sources. Further right is better; the better rank is in green.

Product listingsTurning a sparse product feed and photos into listings that can go live

not measured 3 of 29

Decks from an analysisTurning a finished analysis into a deck you could present as it is

not measured 2 of 29

Marketing planningPlanning a year of ad spend without overspending

not measured 5 of 29

Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls

50 of 159 8 of 159

Professional workReal tasks from banking, consulting and law, business documents and freelance projects

not measured 13 of 51

Reasoning and knowledgeHard questions across science, maths and general knowledge

40 of 187 14 of 187

WritingWhat people prefer in blind comparisons, and judged writing quality

not measured 50 of 169

Sticking to the factsSummarising without inventing things, and factual answers

not measured 48 of 139

Speed under pressureGood decisions against a real clock (fast chess)

not measured 11 of 32

From our research

Muse Wonder review: good analysis, work that still needs checking 13 Oct 2026

Every shared result

Each model's best result on every measure both have, grouped by benchmark, with the setting that produced it. Under each measure, every model that benchmark has measured is a grey tick, best to the right, so you can see where the two sit in the field. The headline measures of each benchmark come first; the rest are under "Show all". Green marks the better value; where a source reports ranges that overlap, neither is marked.

Measure	GPT-5.3-Codex	GPT-6 Sol
Artificial Analysis reported by Artificial Analysis · 3 results
Artificial Analysis Intelligence Indexindex score, higher is better 50 · 11 of 249 measured	32.5xhigh reasoning	47.6max reasoning
Humanity's Last Exam% of questions, higher is better 36 · 16 of 250 measured	42.5%xhigh reasoning	47.9%max reasoning
Long-context reasoning (AA-LCR)% of questions, higher is better 13 · 11 of 241 measured	83.3%xhigh reasoning	83.7%high reasoning
Vending-Bench 2 reported by Vending-Bench 2 · 1 result
Money after a yearUS dollars, higher is better 17 · 2 of 58 measured	$5,940	$14,428

Quick answers

Is GPT-5.3-Codex better than GPT-6 Sol?

Pick GPT-6 Sol: it scores higher (Intelligence Index 47.6 against 32.5) at about the same price.

Which is cheaper, GPT-5.3-Codex or GPT-6 Sol?

They cost about the same: $4.81 and $4.00 per million tokens (three input to one output).

Which is better for agents and tool use, GPT-5.3-Codex or GPT-6 Sol?

GPT-6 Sol ranks 8 of 159 models on sale for multi-step tasks with tools: support desks, coding agents, function calls, against 50 for GPT-5.3-Codex.

Which is better for reasoning and knowledge, GPT-5.3-Codex or GPT-6 Sol?

GPT-6 Sol ranks 14 of 187 models on sale for hard questions across science, maths and general knowledge, against 40 for GPT-5.3-Codex.

Which has the bigger context window, GPT-5.3-Codex or GPT-6 Sol?

GPT-6 Sol: 1,050,000 tokens, against 400,000 for GPT-5.3-Codex.

Run GPT-5.3-Codex and GPT-6 Sol on your own prompt.

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