Gemini 4 Argon vs GPT-5 Chat vs Claude Sonnet 5.5
Gemini 4 Argon comes out ahead, 52 to 46 and 31 on our weighted score, though GPT-5 Chat is 14% cheaper per token.
- Our pick
GoogleGemini 4 Argon
52/100- ECI166.1
- Price$2.00 / $10.00
- Context1.05M
OpenAIGPT-5 Chat
31/100- ECI—
- Price$1.25 / $10.00
- Context400K
AnthropicClaude Sonnet 5.5
46/100- ECI166.7
- Price$2.00 / $10.00
- Context1M
Gemini 4 Argon is our pick
Gemini 4 Argon is the better all-round choice, scoring 52/100 against Claude Sonnet 5.5 (46) and GPT-5 Chat (31). It leads on inputs & features. GPT-5 Chat 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 priceGPT-5 ChatGPT-5 Chat $3.44 · Gemini 4 Argon $4.00 · Claude Sonnet 5.5 $4.00 per 1M tokens (3:1 blend)
- Longest contextGemini 4 ArgonGemini 4 Argon 1,048,576 · Claude Sonnet 5.5 1,000,000 · GPT-5 Chat 400,000 tokens
- Widest inputsGemini 4 ArgonGemini 4 Argon: Text, Images, PDFs, Audio, Video · GPT-5 Chat: Text, Images · Claude Sonnet 5.5: Text, Images, PDFs
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Gemini 4 Argon | GPT-5 Chat | Claude Sonnet 5.5 |
|---|---|---|---|---|
| Price | 50% | 20 | 23 | 20 |
| Inputs & features | 30% | 100 | 35 | 80 |
| Context window | 20% | 61 | 44 | 60 |
| Overall | 100% | 52/100 | 31/100 | 46/100 |
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 | Gemini 4 ArgonGoogle | GPT-5 ChatOpenAI | Claude Sonnet 5.5Anthropic |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 166.1 | — | 166.7 (best) |
| ECI rank | #7 of 165 | — | #5 of 165 (best) |
| GPQA DiamondGraduate-level science questions | 96.4% (best) | — | 95.6% |
| FrontierMath Tiers 1–3Research-level mathematics | 86.0% | — | 88.8% (best) |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% | — | 100% |
| SimpleQA VerifiedShort factual questions | 76.0% (best) | — | 46.5% |
| Price per million tokens | |||
| Input | $2.00 | $1.25 (best) | $2.00 |
| Output | $10.00 | $10.00 | $10.00 |
| Cached input | $0.10 | — | $0.10 |
| Blended (3:1) | $4.00 | $3.44 (best) | $4.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Google API | Median of 5 providers | Official Anthropic API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 400,000 tokens | 1,000,000 tokens |
| Max output | 65,536 tokens | 128,000 tokens (best) | 128,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | Yes |
| Audio | Yes | No | No |
| Video | Yes | No | No |
| Reasoning | Yeslow · medium · high | Yes | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | No | Yes |
| Structured output | Yes | No | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | gemini-4-argon | — | claude-sonnet-5-5 |
| API providers | 24 | 5 | 34 (best) |
| Released | Oct 13, 2026 | Aug 7, 2025 | Sep 28, 2026 |
| Knowledge cutoff | Mar 2026 | Sep 30, 2024 | Jun 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 4 Argon$40.00
- GPT-5 Chat$32.50
- Claude Sonnet 5.5$40.00
Which should you choose?
Which is better: Gemini 4 Argon, GPT-5 Chat or Claude Sonnet 5.5?
Gemini 4 Argon is the better all-round choice, scoring 52/100 against Claude Sonnet 5.5 (46) and GPT-5 Chat (31). It leads on inputs & features. GPT-5 Chat 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, Gemini 4 Argon, GPT-5 Chat or Claude Sonnet 5.5?
GPT-5 Chat is cheaper at $1.25 input / $10.00 output per million tokens (median across 5 API providers). Gemini 4 Argon costs $2.00 input / $10.00 output per million tokens (official Google API price); Claude Sonnet 5.5 costs $2.00 input / $10.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for GPT-5 Chat versus $4.00 for Gemini 4 Argon (1.2× as much) and $4.00 for Claude Sonnet 5.5 (1.2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Gemini 4 Argon has an ECI of 166.1, GPT-5 Chat has not been scored yet and Claude Sonnet 5.5 has an ECI of 166.7.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 4 Argon, GPT-5 Chat and Claude Sonnet 5.5 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Note that GPT-5 Chat does not support tool calling, which most coding agents need.
Which has the bigger context window?
Gemini 4 Argon has the largest context window at 1,048,576 tokens, against 1,000,000 for Claude Sonnet 5.5 and 400,000 for GPT-5 Chat. Maximum output per response: Gemini 4 Argon up to 65,536, GPT-5 Chat up to 128,000, Claude Sonnet 5.5 up to 128,000 tokens.
Which can read images, PDFs, audio or video?
Gemini 4 Argon accepts text, images, PDFs, audio and video; GPT-5 Chat accepts text and images; Claude Sonnet 5.5 accepts text, images and PDFs. Gemini 4 Argon handles the widest range of inputs.
Are any of these open source?
No. Gemini 4 Argon, GPT-5 Chat and Claude Sonnet 5.5 are proprietary and only available through APIs and apps.
Which is newer?
Gemini 4 Argon is the newest, released Oct 13, 2026. Claude Sonnet 5.5 came out Sep 28, 2026; GPT-5 Chat came out Aug 7, 2025. Knowledge cutoff: Gemini 4 Argon Mar 2026, GPT-5 Chat Sep 30, 2024, Claude Sonnet 5.5 Jun 2026.
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.
