What is the best alternative to GPT-5.4 Pro?

GPT-5.4 is the closest model that scores higher on the BenchLeader Index (63.3 against 63.1). For less money, Claude Opus 5.5 scores 69.2 at $8.00 per 1M tokens.

Is there a cheaper alternative to GPT-5.4 Pro?

Yes: Claude Opus 5.5 (69.2, $8.00), Gemini 4 Carbon (68.9, $8.00) and GPT-6 Astra (68.2, $20.00), each within 4 Index points and cheaper than GPT-5.4 Pro's $67.50.

Is there an open-source alternative to GPT-5.4 Pro?

The best open-weights models on the BenchLeader Index are Kimi K3 (62.1), GLM-5 (60.2) and GLM 5.2 (60.1). You can download and run them yourself; check each licence on its model page.

How are these alternatives chosen?

From the models ranked on the BenchLeader Index today: the ones just above GPT-5.4 Pro, cheaper ones within 4 points, ones at least 1.5× as fast within 4 points, and the best open-weights models. Prices are list prices blended three input tokens to one output.

OpenAI

GPT-5.4 Pro alternatives

Data as of 2 Nov 2026 · ranked on the BenchLeader Index

As of 2 Nov 2026, GPT-5.4 Pro by OpenAI scores 63.1 on the BenchLeader Index at $67.50 per 1M tokens blended. GPT-5.4 scores higher (63.3); Claude Opus 5.5 is the best cheaper model within 4 points (69.2 at $8.00); Claude Opus 5.5 is at least 1.5× as fast at a similar score; Kimi K3 is the best open-weights option (62.1).

Scores higher

The closest models above GPT-5.4 Pro on the Index.

GPT-5.4 OpenAI compare63.3 · $5.63
GPT-6 Sol OpenAI compare63.5 · $4.00
Muse Wonder Meta compare64.0 · $8.00

Cheaper, nearly as good

Within 4 Index points, for less per token.

Claude Opus 5.5 Anthropic compare69.2 · $8.00
Gemini 4 Carbon Google compare68.9 · $8.00
GPT-6 Astra OpenAI compare68.2 · $20.00
GPT-6.1 Sol OpenAI compare67.2 · $4.00
Claude Fable 5.1 Anthropic compare67.1 · $20.00

Faster

At least 1.5× the output speed, within 4 points.

Claude Opus 5.5 Anthropic compare69.2 · $8.00
Gemini 4 Carbon Google compare68.9 · $8.00
GPT-6 Astra OpenAI compare68.2 · $20.00

Open weights

The best models whose weights you can run yourself.

Kimi K3 Moonshot AI compare62.1 · $6.00
GLM-5 Zhipu AI60.2 · $1.55
GLM 5.2 Zhipu AI60.1 · $2.15

Every alternative side by side

Model	Index	$ / 1M blended	Tokens / s	Why
GPT-5.4 Pro (this model)	63.1	$67.50	7	–
Claude Opus 5.5	69.2	$8.00	96	cheaper, faster
Gemini 4 Carbon	68.9	$8.00	95	cheaper, faster
GPT-6 Astra	68.2	$20.00	44	cheaper, faster
GPT-6.1 Sol	67.2	$4.00	87	cheaper
Claude Fable 5.1	67.1	$20.00	70	cheaper
Muse Wonder	64.0	$8.00	84	scores higher
GPT-6 Sol	63.5	$4.00	149	scores higher
GPT-5.4	63.3	$5.63	108	scores higher
Kimi K3	62.1	$6.00	66	open weights
GLM-5	60.2	$1.55	62	open weights
GLM 5.2	60.1	$2.15	89	open weights

Prices are list prices blended three input tokens to one output; speeds are measured medians, credited on each model page. The Index is BenchLeader's own, from independent benchmarks.

Questions people ask

What is the best alternative to GPT-5.4 Pro?: GPT-5.4 is the closest model that scores higher on the BenchLeader Index (63.3 against 63.1). For less money, Claude Opus 5.5 scores 69.2 at $8.00 per 1M tokens.
Is there a cheaper alternative to GPT-5.4 Pro?: Yes: Claude Opus 5.5 (69.2, $8.00), Gemini 4 Carbon (68.9, $8.00) and GPT-6 Astra (68.2, $20.00), each within 4 Index points and cheaper than GPT-5.4 Pro's $67.50.
Is there an open-source alternative to GPT-5.4 Pro?: The best open-weights models on the BenchLeader Index are Kimi K3 (62.1), GLM-5 (60.2) and GLM 5.2 (60.1). You can download and run them yourself; check each licence on its model page.
How are these alternatives chosen?: From the models ranked on the BenchLeader Index today: the ones just above GPT-5.4 Pro, cheaper ones within 4 points, ones at least 1.5× as fast within 4 points, and the best open-weights models. Prices are list prices blended three input tokens to one output.