OpenAI, proprietary
GPT-5.3 Chat
GPT-5.3 Chat by OpenAI ranks 109th of 354 ranked models on the Noometry Index as of October 2026, with a score of 42.8. Its strongest category is writing & preference, where it ranks 68th. API pricing starts at $1.75 per million input tokens and $14 per million output tokens, with a 128K-token context window.
Last verified
Specifications
- Noometry rank
- #109 of 354
- Index score
- 42.8
- Evidence
- Confirmed 18 results
- Provider
- OpenAI
- Released
- March 3, 2026
- Weights
- Proprietary
- Reasoning
- No
- Context window
- 128K
- Max output
- 16K
- Input price
- $1.75 / M
- Output price
- $14 / M
- Blended price
- $4.81 / M
- Output speed
- Not measured
- Value
- #188 of 219
- Knowledge cutoff
- August 2025
- Input
- text, image
Category scores
Each category score combines every public result we have in that category.
- Coding 41.4
- Reasoning 28.5
- Math 38.2
- Knowledge 38.8
- Multilingual 50.3
- Instruction Following 72.8
- Long Context 42.6
- Writing & Preference 63.1
| Category | Score | Rank | Results |
|---|---|---|---|
| Coding | 41.4 | #124 | 1 |
| Reasoning | 28.5 | #102 | 1 |
| Math | 38.2 | #142 | 1 |
| Knowledge | 38.8 | #140 | 1 |
| Multilingual | 50.3 | #124 | 1 |
| Instruction Following | 72.8 | #129 | 1 |
| Long Context | 42.6 | #120 | 1 |
| Writing & Preference | 63.1 | #68 | 4 |
Strengths and weaknesses
Categories where GPT-5.3 Chat places highest and lowest among the models ranked in each, with its score against that category's median.
Strongest categories
| Category | Score | vs median | Rank |
|---|---|---|---|
| Writing & Preference | 63.1 | +9.3 | #68 of 312, top 22% |
| Reasoning | 28.5 | +4.9 | #102 of 350, top 30% |
| Coding | 41.4 | +2.7 | #124 of 340, top 37% |
Weakest categories
| Category | Score | vs median | Rank |
|---|---|---|---|
| Knowledge | 38.8 | +1.5 | #140 of 314, top 45% |
| Math | 38.2 | +1.6 | #142 of 327, top 44% |
| Instruction Following | 72.8 | +1.5 | #129 of 305, top 43% |
Closest competitors
The models ranked just above and below GPT-5.3 Chat. When scores are this close, price and speed are often the better way to choose.
| Model | Rank | Score | Blended $/M | Speed | |
|---|---|---|---|---|---|
| o3-pro | #105 | 42.9 | $35 | 1 | Compare |
| Qwen3.5 Plus | #106 | 42.9 | $0.90 | — | Compare |
| Amazon Nova Experimental Chat 26 01 10 | #107 | 42.8 | — | — | Compare |
| DeepSeek-V3.1 | #108 | 42.8 | $0.42 | 328 | Compare |
| GPT-5.5 Instant | #110 | 42.7 | — | — | Compare |
| GPT-5.2 Codex | #111 | 42.6 | $4.81 | — | Compare |
| Qwen3.5-Flash | #112 | 42.5 | $0.18 | — | Compare |
| Nemotron 3 Ultra | #113 | 42.5 | $0.93 | — | Compare |
Sponsored placements are available on pages like this one. Advertise on Noometry
Benchmark results
Every published result we track, with its source. Bold rows are the ones used for ranking; where several exist we prefer independent runs over self-reported numbers.
Coding
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Coding | 1408 | #131 of 294, top 45% | LMArena | 2026-10-08 |
Reasoning
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Hard Prompts | 1399 | #127 of 297, top 43% | LMArena | 2026-10-08 |
Math
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Math | 1389 | #137 of 285, top 49% | LMArena | 2026-10-08 |
Knowledge
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Expert | 1397 | #125 of 273, top 46% | LMArena | 2026-10-08 |
Multilingual
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Non-English | 1382 | #124 of 297, top 42% | LMArena | 2026-10-08 | |
| LMArena Chinese | 1432 | #117 of 285, top 42% | LMArena | 2026-10-08 | |
| LMArena French | 1397 | #120 of 223, top 54% | LMArena | 2026-10-08 | |
| LMArena German | 1384 | #107 of 231, top 47% | LMArena | 2026-10-08 | |
| LMArena Japanese | 1352 | #96 of 211, top 46% | LMArena | 2026-10-08 | |
| LMArena Korean | 1346 | #107 of 213, top 51% | LMArena | 2026-10-08 | |
| LMArena Russian | 1400 | #105 of 283, top 38% | LMArena | 2026-10-08 | |
| LMArena Spanish | 1371 | #131 of 226, top 58% | LMArena | 2026-10-08 |
Instruction Following
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Instruction Following | 1378 | #123 of 298, top 42% | LMArena | 2026-10-08 |
Long Context
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Longer Query | 1396 | #120 of 291, top 42% | LMArena | 2026-10-08 |
Writing & Preference
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena Text | 1389 | #129 of 297, top 44% | LMArena | 2026-10-08 | |
| LMArena Creative Writing | 1355 | #125 of 295, top 43% | LMArena | 2026-10-08 | |
| EQ-Bench Creative Writing | 1690 | #32 of 115, top 28% | EQ-Bench | ||
| LMArena Multi-Turn | 1412 | #107 of 295, top 37% | LMArena | 2026-10-08 |
API pricing by provider
| Route | Input $/M | Output $/M | Cached input $/M | Checked |
|---|---|---|---|---|
| openai | $1.75 | $14 | $0.17 | 2026-10-10 |
Compare GPT-5.3 Chat
- GPT-5.3 Chat vs DeepSeek-V3.1
- GPT-5.3 Chat vs GPT-5.5 Instant
- GPT-5.3 Chat vs Amazon Nova Experimental Chat 26 01 10
- GPT-5.3 Chat vs GPT-5.2 Codex
- GPT-5.3 Chat vs Qwen3.5 Plus
- GPT-5.3 Chat vs Qwen3.5-Flash
- GPT-5.3 Chat vs Claude Fable 5.1
- GPT-5.3 Chat vs Gemini 3.8 Flash
- GPT-5.3 Chat vs Kimi K3
- GPT-5.3 Chat vs Grok 4.6
- GPT-5.3 Chat vs Qwen3.8 Max
- GPT-5.3 Chat vs GLM-5.3
- GPT-5.3 Chat vs Muse Spark 1.3
- GPT-5.3 Chat vs DeepSeek V4 Pro
Other OpenAI models
- GPT-6 Astra70.8
- GPT-6.1 Sol65.6
- GPT-5.6 Sol65.0
- GPT-5.5 Pro64.3
- GPT-5.563.4
- GPT-6 Sol61.8
- GPT-5.459.4
- GPT-5.6 Terra59.2
Frequently asked questions
How good is GPT-5.3 Chat?
GPT-5.3 Chat by OpenAI ranks 109th of 354 ranked models on the Noometry Index as of October 2026, with a score of 42.8. Its strongest category is writing & preference, where it ranks 68th. API pricing starts at $1.75 per million input tokens and $14 per million output tokens, with a 128K-token context window.
How much does GPT-5.3 Chat cost?
GPT-5.3 Chat costs $1.75 per million input tokens and $14 per million output tokens on OpenAI's own API, with cached input at $0.17.
What is GPT-5.3 Chat's context window?
GPT-5.3 Chat accepts up to 128K tokens of input and can write up to 16K tokens in one response.
Is GPT-5.3 Chat open source?
No. GPT-5.3 Chat is proprietary and available only through OpenAI's API and partner platforms.
What are GPT-5.3 Chat's strengths and weaknesses?
Relative to other ranked models, GPT-5.3 Chat places best in writing & preference, reasoning, coding and lowest in knowledge, math, instruction following.
What is GPT-5.3 Chat best at?
Its best category is writing & preference, where it ranks 68th on Noometry.