Is GPT-4o or Grok 2 cheaper?

Per-token pricing isn't published for at least one of these models, check each model's spec page for current rates.

Which has the larger context window?

Both GPT-4o and Grok 2 ship a 128K-token context window.

Is GPT-4o or Grok 2 better for coding?

Both GPT-4o and Grok 2 are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.

Are either of these models open source?

Neither model ships open weights, both are accessible only via their respective providers' APIs.

When were GPT-4o and Grok 2 released?

GPT-4o was released by OpenAI on 2024-05-13. Grok 2 was released by xAI on 2024-08-13.

Is GPT-4o or Grok 2 cheaper?

Per-token pricing isn't published for at least one of these models, check each model's spec page for current rates.

Which has the larger context window?

Both GPT-4o and Grok 2 ship a 128K-token context window.

Is GPT-4o or Grok 2 better for coding?

Both GPT-4o and Grok 2 are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.

Are either of these models open source?

Neither model ships open weights, both are accessible only via their respective providers' APIs.

When were GPT-4o and Grok 2 released?

GPT-4o was released by OpenAI on 2024-05-13. Grok 2 was released by xAI on 2024-08-13.

GPT-4o vs Grok 2

A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.

UpdatedApr 30, 2026

GPT-4o specs · Grok 2 specs

Verdict by category

PriceGPT-4o
GPT-4o publishes pricing ($10.00 / 1M output tokens) while Grok 2 does not.
Context windowTie
Both ship a 128K-token context window.
BenchmarksTie
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores.
ModalitiesGPT-4o
GPT-4o supports 3 modalities (text, vision, audio) vs 2 for Grok 2.
OpennessTie
Both are closed-weight, API-only.

On balance GPT-4o edges ahead, winning 2 of 5 categories against Grok 2's 0. GPT-4o publishes pricing ($10.00 / 1M output tokens) while Grok 2 does not. Both ship a 128K-token context window.

No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. They differ in modality coverage, GPT-4o handles text, vision, audio while Grok 2 handles text, vision, which can be the deciding factor before you even look at benchmarks. Both are closed-weight, API-only.

Grok 2 is the newer of the two, released 3 months after GPT-4o, which usually means a more recent knowledge cutoff and updated safety post-training. GPT-4o is usually picked for chatbots and vision workloads, while Grok 2 sees more deployments in chatbots. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.

Side-by-side specs

Spec	GPT-4o	Grok 2
Provider	OpenAI	xAI
Released	May 2024	Aug 2024
Modalities	text, vision, audio	text, vision
Context window	128K tokens	128K tokens
Max output	,	,
Input · 1M	$2.50 / 1M tokens	Pricing not published
Output · 1M	$10.00 / 1M tokens	Pricing not published
Knowledge cutoff	2023-10	,
Open weights	No	No
API available	Yes	Yes

Pricing at scale

What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.

Light usage, 100k in / 50k out per day$22.50 vs ,
Heavy usage, 1M in / 500k out per day$225 vs ,
RAG workload, 5M in / 200k out per day$435 vs ,

Light usage, 100k in / 50k out per day: pricing not directly comparable (one or both models are missing public per-token rates). Heavy usage, 1M in / 500k out per day: pricing not directly comparable (one or both models are missing public per-token rates). RAG workload, 5M in / 200k out per day: pricing not directly comparable (one or both models are missing public per-token rates).

Price calculator

Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.

Input tokens / dayOutput tokens / dayHorizon

GPT-4o$0.750
Grok 2Pricing unavailable

Benchmarks compared

Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.

GPT-4oGrok 2

MMLU88.7
HumanEval90.2

Pick GPT-4o if

GPT-4o fits when…

Native multimodal
Mature SDK and tooling
Multimodal needs covering audio.

Pick Grok 2 if

Grok 2 fits when…

Free on X Premium
Real-time data

Don't want either?

Consider GPT-5.5

OpenAI's mid-cycle GPT-5 refresh, improved reasoning, tool use, and multimodal grounding over the 2025 launch.

See GPT-5.5 specs GPT-4o vs GPT-5.5 Grok 2 vs GPT-5.5

Frequently asked

Is GPT-4o or Grok 2 cheaper?
Per-token pricing isn't published for at least one of these models, check each model's spec page for current rates.
Which has the larger context window?
Both GPT-4o and Grok 2 ship a 128K-token context window.
Is GPT-4o or Grok 2 better for coding?
Both GPT-4o and Grok 2 are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.
Are either of these models open source?
Neither model ships open weights, both are accessible only via their respective providers' APIs.
When were GPT-4o and Grok 2 released?
GPT-4o was released by OpenAI on 2024-05-13. Grok 2 was released by xAI on 2024-08-13.

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