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Models / OpenAI

GPT-5.3 Codex (xhigh)

GPT-5.3 Codex · Released 2026-02-05

AA Intelligence Index 44.3. Listed on Artificial Analysis with API pricing $1.75/$14 per 1M tokens. Benchmark rows sync from the AA snapshot — see the ledger on this page.

Frontier model tracked on Artificial Analysis. Use the benchmark ledger below for sourced scores; we do not infer numbers beyond published rows.

#35 of 168 on AA Index · current snapshot
46 AA Index · 9 benchmark rows · 1 sourcesPosition is benchmark-specific — not a cross-family or cross-source ranking.
Composite63
Context128K
Input / 1M$1.8
Output / 1M$14
Knowledge cutoffopen
Output speed117 t/s
TTFT (default API)35.84s
Statussolid

Family profile

Best published score in each covered benchmark family.

69/100 avg
Reasoning
92
Coding
53
Agentic
53
Long context
78

4 tested benchmark families

Benchmark placements

Where GPT-5.3 Codex (xhigh) places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.

BenchmarkFamilyRankScoreSourceDate
AA time to first tokenPerformance#8/ 186Artificial Analysis2026-09-01
AA-LCRLong context#16/ 17978Artificial Analysis2026-09-01
Humanity's Last ExamReasoning#22/ 18043Artificial Analysis2026-09-01
SciCodeCoding#25/ 18053Artificial Analysis2026-09-01
GPQA DiamondReasoning#26/ 18592Artificial Analysis2026-09-01
IFBenchReasoning#28/ 12775Artificial Analysis2026-09-01
AA output speedPerformance#31/ 187Artificial Analysis2026-09-01
Artificial Analysis Intelligence IndexReasoning#45/ 18746Artificial Analysis2026-09-01
Terminal-BenchAgentic#83/ 18453Artificial Analysis2026-09-01
Family context

The three highest-scoring models with pages in each capability family. Where GPT-5.3 Codex (xhigh) shows up, it's highlighted.

ReasoningGPT-5.3 Codex (xhigh) · 92
  1. 1
    Claude Mythos Preview
    95
  2. 2
    Gemini 3.7 Flash
    95
  3. 3
    Grok 4.6
    95
CodingGPT-5.3 Codex (xhigh) · 53
  1. 1
    GPT 5.5
    96
  2. 2
    Claude Opus 4.8
    96
  3. 3
    Claude Opus 4.6
    96
AgenticGPT-5.3 Codex (xhigh) · 53
  1. 1
    GPT 5.5
    100
  2. 2
    Claude Opus 4.8
    100
  3. 3
    Claude Fable 5
    100
Long contextGPT-5.3 Codex (xhigh) · 78
  1. 1
    Muse Spark 1.2
    83
  2. 2
    Kimi K3
    83
  3. 3
    Gemini 3.5 Flash
    81
Newest receipts

Benchmark rows added to the public ledger for GPT-5.3 Codex (xhigh) in the last 120 days. Older rows live in the full table below.

9 recent
BenchmarkFamilyScoreSourceDays ago
AA-LCRLong context78.33%Artificial Analysis5
AA output speedPerformance117 t/sArtificial Analysis5
AA time to first tokenPerformance35.84sArtificial Analysis5
Artificial Analysis Intelligence IndexReasoning45.5%Artificial Analysis5
GPQA DiamondReasoning91.5%Artificial Analysis5
Humanity's Last ExamReasoning42.5%Artificial Analysis5
IFBenchReasoning75.37%Artificial Analysis5
SciCodeCoding53.2%Artificial Analysis5
Terminal-BenchAgentic53.03%Artificial Analysis5
Family coverage

A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.

Reasoning92
Coding53
Agentic53
Long context78
Price vs. performance
0255075100$0.10$0.30$1$3$10$30input USD / 1M tokens · log scale →← intelligence

Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.

AnthropicOpenAIMistralAlibabaDeepSeekGoogleMoonshotMetaMiniMaxxAIZhipuXiaomiOtherMeituanCohereNVIDIA

Full benchmark ledger

Every catalog benchmark for GPT-5.3 Codex (xhigh). Scores link to the original source; gaps mean no public row exists yet.

9 sourced rows

9 of 37 catalog benchmarks have a sourced row for GPT-5.3 Codex (xhigh).

Reasoning

Coding

Agentic

Long context

Performance

Sources