Aion-3.0 vs GPT-5.3 Chat vs Command A Plus
Command A Plus comes out ahead, 35 to 28 and 26 on our weighted score, though Aion-3.0 is 14% cheaper per token.
Aion Labs
Aion-3.0
26/100- ECI—
- Price$3.00 / $6.00
- Context131K
OpenAIGPT-5.3 Chat
28/100- ECI—
- Price$1.75 / $14.00
- Context128K
- Our pick
CohereCommand A Plus
35/100- ECI—
- Price$2.50 / $10.00
- Context128K
Command A Plus is our pick
Command A Plus is the better all-round choice, scoring 35/100 against GPT-5.3 Chat (28) and Aion-3.0 (26). It leads on inputs & features. Aion-3.0 wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceAion-3.0Aion-3.0 $3.75 · Command A Plus $4.38 · GPT-5.3 Chat $4.81 per 1M tokens (3:1 blend)
- Longest contextAion-3.0Aion-3.0 131,072 · GPT-5.3 Chat 128,000 · Command A Plus 128,000 tokens
- Widest inputsGPT-5.3 Chat and Command A PlusAion-3.0: Text · GPT-5.3 Chat: Text, Images · Command A Plus: Text, Images
- Self-hostingCommand A PlusPublishes downloadable weights
| Measure | Weight | Aion-3.0 | GPT-5.3 Chat | Command A Plus |
|---|---|---|---|---|
| Price | 50% | 22 | 17 | 19 |
| Inputs & features | 30% | 35 | 50 | 70 |
| Context window | 20% | 25 | 24 | 24 |
| Overall | 100% | 26/100 | 28/100 | 35/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Aion-3.0Aion Labs | GPT-5.3 ChatOpenAI | Command A PlusCohere |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $3.00 | $1.75 (best) | $2.50 |
| Output | $6.00 (best) | $14.00 | $10.00 |
| Cached input | — | — | — |
| Blended (3:1) | $3.75 (best) | $4.81 | $4.38 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 4 providers | Median of 4 providers | Official Cohere API |
| Limits | |||
| Context window | 131,072 tokens (best) | 128,000 tokens | 128,000 tokens |
| Max output | 32,768 tokens | 16,384 tokens | 64,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | Yes | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yes | No | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Open |
| API model ID | — | — | command-a-plus-05-2026 |
| API providers | 4 (best) | 4 (best) | 3 |
| Released | May 5, 2026 | Mar 3, 2026 | May 20, 2026 |
| Knowledge cutoff | — | Aug 31, 2025 | Apr 1, 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Aion-3.0$42.00
- GPT-5.3 Chat$45.50
- Command A Plus$45.00
Which should you choose?
Which is better: Aion-3.0, GPT-5.3 Chat or Command A Plus?
Command A Plus is the better all-round choice, scoring 35/100 against GPT-5.3 Chat (28) and Aion-3.0 (26). It leads on inputs & features. Aion-3.0 wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Aion-3.0, GPT-5.3 Chat or Command A Plus?
Aion-3.0 is cheaper at $3.00 input / $6.00 output per million tokens (median across 4 API providers). Command A Plus costs $2.50 input / $10.00 output per million tokens (official Cohere API price); GPT-5.3 Chat costs $1.75 input / $14.00 output per million tokens (median across 4 API providers). At a typical mix of three input tokens to one output token, that is $3.75 per million tokens for Aion-3.0 versus $4.38 for Command A Plus (1.2× as much) and $4.81 for GPT-5.3 Chat (1.3× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Aion-3.0 has not been scored yet, GPT-5.3 Chat has not been scored yet and Command A Plus has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Aion-3.0, GPT-5.3 Chat and Command A Plus yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
Aion-3.0 has the largest context window at 131,072 tokens, against 128,000 for GPT-5.3 Chat and 128,000 for Command A Plus. Maximum output per response: Aion-3.0 up to 32,768, GPT-5.3 Chat up to 16,384, Command A Plus up to 64,000 tokens.
Which can read images, PDFs, audio or video?
Aion-3.0 accepts text; GPT-5.3 Chat accepts text and images; Command A Plus accepts text and images. GPT-5.3 Chat handles the widest range of inputs.
Are any of these open source?
Command A Plus publishes its weights and can be self-hosted; Aion-3.0 and GPT-5.3 Chat is proprietary.
Which is newer?
Command A Plus is the newest, released May 20, 2026. Aion-3.0 came out May 5, 2026; GPT-5.3 Chat came out Mar 3, 2026. Knowledge cutoff: GPT-5.3 Chat Aug 31, 2025, Command A Plus Apr 1, 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
