Best GPT-5.3 Codex Alternatives
GPT-5.3 Codex by OpenAI is a flagship model priced at $2/16 per 1M tokens (in/out). It's on the expensive side — there are cheaper options with similar quality.
GPT-5.3 Codex
OpenAIFlagshipInput
$2/1M
Output
$16/1M
Context
200K
Max Output
66K
Why Switch from GPT-5.3 Codex?
Top Alternatives
22% cheaper, higher benchmark scores, 1M context (5x more).
Input
$2/1M
Same price
Output
$12/1M
25% cheaper
Context
1M
Max Output
64K
13% cheaper, comparable performance.
Input
$1.75/1M
13% cheaper
Output
$14/1M
13% cheaper
Context
200K
Max Output
66K
Dramatically cheaper (61% less), comparable performance.
Input
$2/1M
Same price
Output
$5/1M
69% cheaper
Context
128K
Max Output
16K
38% cheaper, adds audio.
Input
$1.25/1M
38% cheaper
Output
$10/1M
38% cheaper
Context
128K
Max Output
16K
22% cheaper, comparable performance, 1M context (5x more).
Input
$2/1M
Same price
Output
$12/1M
25% cheaper
Context
1M
Max Output
66K
Comparable performance.
Input
$5/1M
150% more
Output
$25/1M
56% more
Context
200K
Max Output
32K
Adds web-search.
Input
$3/1M
50% more
Output
$15/1M
6% cheaper
Context
128K
Max Output
16K
Dramatically cheaper (77% less).
Input
$1/1M
50% cheaper
Output
$3.2/1M
80% cheaper
Context
200K
Max Output
128K
Full Comparison Table
| Model | Input $/1M | Output $/1M | Context | MMLU-Pro | HumanEval | Score |
|---|---|---|---|---|---|---|
| Gemini 3.1 ProGoogle | $2.00Same price | $12.0025% cheaper | 1M | 91%+1.0% | 95%-1.5% | 95 |
| GPT-5.2 CodexOpenAI | $1.7513% cheaper | $14.0013% cheaper | 200K | 89%-1.0% | 95.5%-1.0% | 93 |
| Mistral Large 3Mistral | $2.00Same price | $5.0069% cheaper | 128K | 83%-7.0% | 91%-5.5% | 93 |
| GPT-5OpenAI | $1.2538% cheaper | $10.0038% cheaper | 128K | 88.5%-1.5% | 95%-1.5% | 88 |
| Gemini 3 ProGoogle | $2.00Same price | $12.0025% cheaper | 1M | 89.8%-0.2% | 94%-2.5% | 88 |
| Claude Opus 4.6Anthropic | $5.00150% more | $25.0056% more | 200K | 89.5%-0.5% | 95%-1.5% | 83 |
| Grok 4xAI | $3.0050% more | $15.006% cheaper | 128K | 86%-4.0% | 93%-3.5% | 78 |
| GLM-5Zhipu AI | $1.0050% cheaper | $3.2080% cheaper | 200K | 70.4%-19.6% | 91%-5.5% | 75 |
| Gemini 2.5 ProGoogle | $1.2538% cheaper | $10.0038% cheaper | 1M | 87.5%-2.5% | 93.5%-3.0% | 73 |
| Claude Sonnet 4.6Anthropic | $3.0050% more | $15.006% cheaper | 200K | 86%-4.0% | 94%-2.5% | 68 |
| o4-miniOpenAI | $1.1045% cheaper | $4.4073% cheaper | 200K | 85%-5.0% | 93.5%-3.0% | 68 |
| o3OpenAI | $0.4080% cheaper | $1.6090% cheaper | 200K | 87%-3.0% | 94.5%-2.0% | 68 |
| Gemini 3 FlashGoogle | $0.5075% cheaper | $3.0081% cheaper | 1M | 78%-12.0% | 90%-6.5% | 68 |
| GLM-4.7Zhipu AI | $0.6070% cheaper | $2.2086% cheaper | 200K | 84.3%-5.7% | — | 62 |
| Claude Sonnet 4.5Anthropic | $3.0050% more | $15.006% cheaper | 200K | 84.5%-5.5% | 93%-3.5% | 60 |
| GPT-4oOpenAI | $2.5025% more | $10.0038% cheaper | 128K | 80.5%-9.5% | 91%-5.5% | 60 |
| Claude Haiku 4.5Anthropic | $0.8060% cheaper | $4.0075% cheaper | 200K | 69.4%-20.6% | 88.1%-8.4% | 54 |
| Mistral Medium 3Mistral | $0.4080% cheaper | $2.0088% cheaper | 128K | 76%-14.0% | 87%-9.5% | 54 |
| Gemini 2.5 FlashGoogle | $0.1593% cheaper | $0.6096% cheaper | 1M | 76%-14.0% | 89.5%-7.0% | 50 |
| DeepSeek R1DeepSeek | $0.5573% cheaper | $2.1986% cheaper | 128K | 84%-6.0% | 92%-4.5% | 48 |
| Llama 4 MaverickMeta | $0.3185% cheaper | $0.8595% cheaper | 1M | 80.5%-9.5% | 90.2%-6.3% | 46 |
| DeepSeek V3DeepSeek | $0.1493% cheaper | $0.2898% cheaper | 164K | 78%-12.0% | 89%-7.5% | 46 |
| MiniMax M2.5MiniMax | $0.3085% cheaper | $1.2093% cheaper | 200K | 82%-8.0% | 90%-6.5% | 46 |
| GPT-4o MiniOpenAI | $0.1593% cheaper | $0.6096% cheaper | 128K | 68%-22.0% | 87.2%-9.3% | 44 |
| Llama 4 ScoutMeta | $0.1891% cheaper | $0.6396% cheaper | 10M | 74.2%-15.8% | 86%-10.5% | 38 |