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GPT-5.3 Codex

OpenAIReleased Feb 24, 2026Closed weightsgpt-5.3-codex

Intelligence (Epoch)
157 · 19th of 111
Knowledge cutoff
August 2025
Context
400K tokens
Max output
128K tokens
OpenAI's API
yes, as gpt-5.3-codex

Read Oct 17, 00:00 UTC from the hosts' published offers and OpenRouter, spec sheet from OpenAI · cutoff: developers.openai.com

Input, per M$1.75at OpenAI
Cache, per M$0.17at OpenAI
Providers1its maker's own price, for reference

Intelligence for the price

8 models score higher for the same price or less; it ranks 9 of the 102 models at its price or below.

100120140160180$0.10$1$10$100GPT-4o mini: 126 at $0.75gpt-oss-20b: 138 at $0.12GPT-4.1 mini: 135 at $2.00Gemini 3.6 Flash: 155 at $4.50Llama 3.3 70B: 127 at $0.42Llama 3.1 8B: 116 at $0.06gpt-oss-120b: 140 at $0.18DeepSeek Chat: 146 at $1.21DeepSeek R1: 139 at $2.65Llama 4 Scout: 130 at $0.40Llama 4 Maverick: 132 at $1.00Qwen 2.5 72B: 129 at $0.76Gemma 3 27B: 130 at $0.24DeepSeek V3.2: 146 at $0.52Kimi K2.6: 151 at $2.40GLM 5.2: 152 at $2.36Qwen3.8 27B: 152 at $1.29Gemini 3.8 Flash: 157 at $4.50Gemini 3.7 Flash: 158 at $4.50Gemini 3.5 Flash-Lite: 145 at $2.80DeepSeek V4 Pro 0813: 156 at $2.50DeepSeek V4.1 Flash: 156 at $0.47GLM-5.3: 156 at $2.36Grok 4.6: 157 at $8.00Grok 4.7: 154 at $8.00Grok 4.5: 154 at $8.00Claude Opus 5: 164 at $30.00Claude Opus 5.5: 169 at $24.00Claude Sonnet 5: 157 at $12.00Claude Fable 5: 163 at $60.00Claude Fable 5.1: 166 at $60.00GPT-6 Astra: 169 at $60.00GPT-6 Sol: 164 at $12.00GPT-6 Luna: 157 at $0.60GPT-5.6 Sol: 163 at $24.00GPT-5.6 Terra: 160 at $14.00GPT-5.6 Luna: 156 at $1.40DeepSeek V4 Flash 0731: 155 at $0.21GLM-5.3-Flash: 153 at $0.19Kimi K3: 158 at $11.35DeepSeek V4 Pro 0423: 149 at $2.40Kimi K2.7 Code: 150 at $3.71DeepSeek V4 Flash 0423: 146 at $0.21GLM 5.1: 150 at $4.00Gemma 4 31B: 143 at $0.38MiniMax-M3: 147 at $1.19Qwen3 235B A22B Instruct 2507: 139 at $0.44Qwen3.6 35B A3B: 144 at $1.00MiniMax M2.7: 146 at $1.05Qwen3.5 397B A17B: 147 at $3.45GLM 5: 146 at $2.52Gemma 4 26B A4B: 142 at $0.26MiniMax M2.5: 147 at $1.22Qwen3.5-35B-A3B: 142 at $1.14Kimi K2.5: 148 at $2.70DeepSeek V3.1: 140 at $1.20Qwen3.6 27B: 146 at $2.25GLM 4.7: 144 at $2.15Qwen3.5 9B: 139 at $0.25Qwen3 30B A3B: 136 at $0.24Nemotron 3 Ultra: 146 at $2.70Mistral Nemo: 119 at $0.038Mistral Medium 3.5: 141 at $9.00DeepSeek V3.2 Exp: 145 at $0.34Qwen3 235B A22B Thinking 2507: 144 at $2.53Mistral Medium 3: 134 at $2.40Qwen3 14B: 138 at $0.32Llama 3.1 70B Instruct: 126 at $0.80Mixtral 8x22B Instruct: 122 at $8.00Kimi K2 Thinking: 146 at $3.10Qwen3 32B: 138 at $0.36DeepSeek V3: 132 at $1.21Inkling: 148 at $5.00Inkling Small: 150 at $1.65Qwen3 Max: 142 at $7.20Gemma 3 12B: 124 at $0.15Qwen3.8 Max: 157 at $8.00Qwen3.7 Max: 154 at $5.00Qwen3.7 Flash: 144 at $0.16Qwen3.7 Plus: 147 at $2.00Qwen3.5 Plus 2026-04-20: 146 at $2.80Qwen3.6 Flash: 143 at $1.75Qwen3.6 Max Preview: 149 at $9.10Qwen3.6 Plus: 147 at $3.50Qwen3.5-Flash: 144 at $0.50Qwen3 30B A3B Thinking 2507: 140 at $2.60Qwen3 8B: 136 at $0.88Mistral Small 3.1 24B: 128 at $0.91Gemma 3 4B: 116 at $0.09Phi 4: 130 at $0.21Qwen2.5 Coder 32B Instruct: 119 at $1.66Qwen2.5 7B Instruct: 119 at $0.30Command R+ (08-2024): 119 at $12.50Gemma 2 27B: 122 at $1.30Claude Sonnet 5.5: 166 at $12.00GPT-6.1 Sol: 168 at $12.00Gemini 4 Argon: 166 at $12.00Mistral Large 4: 150 at $5.54Claude Haiku 5.5: 159 at $0.60Muse Wonder: 162 at $24.00Muse Spark 1.3: 157 at $5.50Muse Spark Open: 155 at $5.50GPT-4.1: 137 at $10.00Claude Opus 4.1: 144 at $90.00Claude Sonnet 4.5: 147 at $18.00Claude Haiku 4.5: 142 at $6.00Gemini 2.5 Pro: 145 at $11.25Gemini 2.5 Flash: 141 at $2.80Gemini 3.1 Pro Preview: 155 at $14.00Gemini 3 Flash Preview: 152 at $3.50GPT-5.3 Codex · 157

Epoch Capabilities Index against the lowest input + output price per M, log scale · prices Oct 17. Score: Epoch AI, CC BY 4.0, 157 with an interval of 154 to 161.

Against its rivals

The best of its price range and the top score

Same level for 83× less: GLM-5.3-Flash at StreamLake, $0.19 per M input + output · their Epoch intervals overlap (153 against 157).

Bars: Epoch Capabilities Index (Epoch AI, CC BY 4.0), drawn from 100, below the lowest score in the catalogue · price: lowest input + output per M.

ProviderInputOutputCache ↑Checked
OpenAI$1.75$14.00$0.17Oct 17

1 provider · prices per million tokens, read Oct 17, 00:00 UTC

ProviderWeightsContextMax outputToolsStructured outputsReasoning
OpenAI—400K125K———

As served by each host and declared to OpenRouter; not verified by us · weights: the precision the host declares

GPT-5.3 Codex spec sheet, field by field, with sources

GPT-5.3 Codex spec sheetmaker-declared

What OpenAI declares about the model itself — read from its own weights repository and documentation, not from any host. What each endpoint actually serves is in the pricing above: the two can differ, and both are true.

Context window
400,000 tokens
Parameters
to verify
Active experts
to verify
Weight precision
not applicable — no weights publishedcurated
License
Proprietary — API onlycuratedScope: the licence on the published weights, and nothing else. It is not the maker's acceptable-use policy, which is a separate document, and it is not the contract you sign with whichever host you call — hosts set their own terms, which this index does not read.
Knowledge cutoff
August 31, 2025
Modalities
to verify
Max output (official)
128,000 tokens
Release date
February 24, 2026maker's docs · read 2026-10-17
Maker lifecycle status
Deprecatedmaker's docs · read 2026-10-17

developers.openai.com · maker's documentation · read 2026-10-17 · 6 of 10 fields published by the maker

ProviderChatbot 1,000 in / 500 outRAG / long context 8,000 in / 500 outBatch summarize 4,000 in / 1,000 out
OpenAI$8.75$21.00$21.00

What each host bills for 1,000 requests of a representative job

Your own workload

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