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OpenAI: GPT-5.3 Codex Spark

Coding-optimized GPT model for repository edits, reviews, and agentic software work

Source-linked gpt-codex-spark Closed weights Released 2026-02-05
API record Report
InputT
OutputT
Input price$1.75/M
Output price$14/M
Context128K
Max output32K
Providers4
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

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Providers offering GPT-5.3 Codex Spark
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
Poe openai/gpt-5.3-codex-spark 128K 16.384K ReasoningTools Docs ↗
OpenAI gpt-5.3-codex-spark 128K 32K $1.75 $14 $0.175 ReasoningToolsJSON Docs ↗
Cloudflare AI Gateway openai/gpt-5.3-codex-spark 128K 32K $1.75 $14 $0.175 ReasoningToolsJSON Docs ↗
OpenCode Zen gpt-5.3-codex-spark 128K 128K $1.75 $14 $0.175 ReasoningToolsJSON Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $1.75/M

Across 3 priced providers

Median input $1.75/M

Midpoint of listed rates

Highest input $1.75/M

Same as the lowest listed rate

Output range $14 – $14

Per million output tokens

OpenAI $1.75/M
Cloudflare AI Gateway $1.75/M
OpenCode Zen $1.75/M
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.

3 providers list the identical $1.75 input rate, so price alone will not separate them — compare context limits, max output, and capabilities above.

Specification

Capabilities

Recorded from the source catalog and provider listings.

Reasoning Yes
Tool calling Yes
Structured output Yes
Attachments Yes
Vision input Yes
× Open weights No
Creator
OpenAI
Model family
gpt-codex-spark
Knowledge cutoff
2025-08-31
License
Not documented
Release date
2026-02-05
Model ID
openai/gpt-5.3-codex-spark
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://www.modelbench.lol/api/v1/models/openai/gpt-5.3-codex-spark
curl
curl "https://www.modelbench.lol/api/v1/models/openai/gpt-5.3-codex-spark"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is GPT-5.3 Codex Spark?

Coding-optimized GPT model for repository edits, reviews, and agentic software work. It is published by OpenAI and catalogued here from Models.dev.

How much does GPT-5.3 Codex Spark cost?

Listed input pricing starts at $1.75 per million tokens from OpenAI.

What is the context length of GPT-5.3 Codex Spark?

GPT-5.3 Codex Spark accepts up to 128K tokens of context and returns up to 32K output tokens.

Does GPT-5.3 Codex Spark support tool calling and structured output?

Provider catalogs list support for tool calling, structured output, reasoning, and image input.

Which providers serve GPT-5.3 Codex Spark?

4 providers list this model: Poe, OpenAI, Cloudflare AI Gateway, OpenCode Zen.

Are the weights for GPT-5.3 Codex Spark open?

No. This model is served through hosted APIs only.

When was GPT-5.3 Codex Spark released?

The catalog records a release date of 2026-02-05, last verified Aug 17, 2026.

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