GPT-5.3-Codex vs GPT-5.4
Why this pair: Coding-specialized and general professional OpenAI models
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | GPT-5.3-Codex | GPT-5.4 |
|---|---|---|
| Developer | Openai | Openai |
| Family | Gpt 5 3 | Gpt 5 4 |
| Model | GPT-5.3-Codex | GPT-5.4 |
| Version | GPT-5.3-Codex | GPT-5.4 |
| Lifecycle | active | active |
| Released | Unknown | 2026-03-05 |
| Knowledge cutoff | 2025-08-31 | 2025-08-31 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 400,000 | 1,050,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
12 comparable fields · 4 material differences · Interactive comparison only; indexing gate not met
GPT-5.3-Codex Capabilities
GPT-5.4 Capabilities
Internal Comparison Graph
Related Comparisons
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Claude Sonnet 4.6Anthropic | vs | GPT-5.4OpenAI | cross-developer peersimage, text |
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Primary Evidence
Sources and Freshness
Questions
GPT-5.3-Codex vs GPT-5.4 FAQs
Is GPT-5.3-Codex or GPT-5.4 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.3-Codex and GPT-5.4, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.3-Codex or GPT-5.4?+
GPT-5.3-Codex is $1.75 and GPT-5.4 is $2.50 per million tokens, so GPT-5.3-Codex is cheaper on this metric. GPT-5.3-Codex is $14.00 and GPT-5.4 is $15.00 per million tokens, so GPT-5.3-Codex is cheaper on this metric.
Which has a larger context window, GPT-5.3-Codex or GPT-5.4?+
GPT-5.4 has the larger sourced context window. GPT-5.3-Codex supports 400,000 and GPT-5.4 supports 1,050,000.
Which performs better in benchmarks, GPT-5.3-Codex or GPT-5.4?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.3-Codex or GPT-5.4 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.3-Codex is not marked open weight; GPT-5.4 is not marked open weight.
Can GPT-5.3-Codex and GPT-5.4 understand images?+
GPT-5.3-Codex is not documented with image input; GPT-5.4 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.3-Codex or GPT-5.4?+
Neither has a larger sourced maximum output. GPT-5.3-Codex is 128,000 and GPT-5.4 is 128,000.
Do GPT-5.3-Codex and GPT-5.4 support reasoning and tool use?+
GPT-5.3-Codex: reasoning and tool calling. GPT-5.4: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.3-Codex or GPT-5.4?+
GPT-5.3-Codex has 2 sourced provider routes; GPT-5.4 has 2, a tie.
Which offers better value, GPT-5.3-Codex or GPT-5.4?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.