Can I run GLM 4.5 Air (free) or gpt-oss-20b cheaper on another provider?

Some models are available on inference providers like Together AI, Groq, and Fireworks AI at lower prices. Check each model's pricing page for the full provider comparison.

What is the context window difference between GLM 4.5 Air (free) and gpt-oss-20b?

gpt-oss-20b has a larger context window at 131K tokens vs 131K. This matters for long documents, large codebases, and extended conversation histories.

Compare

GLM 4.5 Air (free) vs gpt-oss-20b

Pricing is only the shared seller matrix below. Best rates and catalog map are separate sections, so no chart is embedded in pricing. Open the calculator for the same workload on each side.

Z Ai

Model

GLM 4.5 Air (free)

Tool calling

Best N/A in · N/A out

Context window 131K

Pricing

OpenAI

Model

gpt-oss-20b

Tool calling

Best $0.020 in · $0.100 out

Context window 131K

Pricing

GLM 4.5 Air (free) is cheaper across the board — 100% cheaper on input and 100% cheaper on output.

Estimate cost

Pricing matrix

Shared sellers only. Each row is a host that lists both models. Dollar amounts are per 1M tokens. Lowest in each pair of columns is emphasized.

Provider	GLM 4.5 Air (free) in	GLM 4.5 Air (free) out	gpt-oss-20b in	gpt-oss-20b out
DeepInfra	N/A	N/A	$0.040	$0.150
Fireworks AI	N/A	N/A	$0.050	$0.200
Groq	N/A	N/A	$0.075	$0.300
Novita	N/A	N/A	$0.040	$0.150
Openrouter	N/A	N/A	$0.029	$0.140
Ovhcloud	N/A	N/A	$0.040	$0.150
Replicate	N/A	N/A	$0.090	$0.360
Together AI	N/A	N/A	$0.050	$0.200
Wandb	N/A	N/A	$5000.00	$20000.00

Best listed rates (this pair)

Same "best row in current pricing" logic as model pages: a compact view of the lowest input and output we show for each side. This is not the seller matrix.

Catalog map · Z Ai · OpenAI

Each chart uses real catalog rows that include both list input and list output ($/1M). Larger green dots are the models on this comparison page; accent dots are other active models from that provider.

Z Ai · input vs output

Scatter chart: X = input $/M, Y = output $/M. This page's models are labeled on the green dots; hover others for detail.

ListedoutputUSD/1M

One dot per catalog row that has both list prices. Green dots are labeled with the models on this page; hover any dot for name and prices. Upper-right means higher cost on both axes ($/1M).

OpenAI · input vs output

ListedoutputUSD/1M

One dot per catalog row that has both list prices. Green dots are labeled with the models on this page; hover any dot for name and prices. Upper-right means higher cost on both axes ($/1M).

Specifications

Each column header is the full model name. Tint marks the favorable value where we compute a winner.

Spec

GLM 4.5 Air (free)

gpt-oss-20b

Context window: 131,072 tokens; 131,072 tokens
Max output tokens: 96,000 tokens; 131,072 tokens
Vision: No; No
Function calling: Yes; Yes
Streaming: Yes; No
Release date: Jul 2025; Aug 2025

Cost calculator

Same requests, input tokens, and output tokens for both columns. Pick the provider row that matches how you buy.

GLM 4.5 Air (free)

gpt-oss-20b

Requests / day

Input tokens

Output tokens

GLM 4.5 Air (free)

Monthly

$0.0000

Annual

$0.0000

gpt-oss-20b

Monthly

$21

Annual

$255

Save $21/month with GLM 4.5 Air (free)

When to pick which

Short takeaways: no cards, just the points. Validate with your own workloads.

Long output (reports, code files)
Use gpt-oss-20b. Its 131K max output limit reduces the need to split requests.

Frequently asked questions

GLM 4.5 Air (free) is cheaper on both input and output tokens.

More comparisons

Other popular head-to-head matchups.