Claude Opus 4.8 vs GPT-5.6 Cyber
Claude Opus 4.8 comes out ahead, 37 to 30 on our weighted score, and it is the cheaper option too.
- Our pick
AnthropicClaude Opus 4.8
37/100- ECI158.3
- Price$5.00 / $25.00
- Context1M
OpenAIGPT-5.6 Cyber
30/100- ECI—
- Price$12.50 / $75.00
- Context400K
Add a model
Make it a three-way comparison.
Claude Opus 4.8 is our pick
Claude Opus 4.8 is the better all-round choice, scoring 37/100 against GPT-5.6 Cyber (30). It leads on price, inputs & features and context window. 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 priceClaude Opus 4.8Claude Opus 4.8 $10.00 · GPT-5.6 Cyber $28.13 per 1M tokens (3:1 blend)
- Longest contextClaude Opus 4.8Claude Opus 4.8 1,000,000 · GPT-5.6 Cyber 400,000 tokens
- Widest inputsClaude Opus 4.8Claude Opus 4.8: Text, Images, PDFs · GPT-5.6 Cyber: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Claude Opus 4.8 | GPT-5.6 Cyber |
|---|---|---|---|
| Price | 50% | 2 | 0 |
| Inputs & features | 30% | 80 | 70 |
| Context window | 20% | 60 | 44 |
| Overall | 100% | 37/100 | 30/100 |
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 | Claude Opus 4.8Anthropic | GPT-5.6 CyberOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 158.3 | — |
| ECI rank | #12 of 148 | — |
| GPQA DiamondGraduate-level science questions | 91.0% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 80.0% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 98.3% | — |
| SimpleQA VerifiedShort factual questions | 53.0% | — |
| Price per million tokens | ||
| Input | $5.00 (best) | $12.50 |
| Output | $25.00 (best) | $75.00 |
| Cached input | $0.50 (best) | $1.25 |
| Blended (3:1) | $10.00 (best) | $28.13 |
| Long-context rate | Same rate | Same rate |
| Price source | Official Anthropic API | Official OpenAI API |
| Limits | ||
| Context window | 1,000,000 tokens (best) | 400,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yeslow · medium · high · xhigh · max | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | claude-opus-4-8 | gpt-daybreak-red-latest |
| API providers | 45 (best) | 1 |
| Released | May 28, 2026 | Aug 7, 2026 |
| Knowledge cutoff | Jan 2026 | Feb 16, 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Opus 4.8$100.00
- GPT-5.6 Cyber$275.00
Which should you choose?
Which is better: Claude Opus 4.8 or GPT-5.6 Cyber?
Claude Opus 4.8 is the better all-round choice, scoring 37/100 against GPT-5.6 Cyber (30). It leads on price, inputs & features and context window. 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, Claude Opus 4.8 or GPT-5.6 Cyber?
Claude Opus 4.8 is cheaper at $5.00 input / $25.00 output per million tokens (official Anthropic API price). GPT-5.6 Cyber costs $12.50 input / $75.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $10.00 per million tokens for Claude Opus 4.8 versus $28.13 for GPT-5.6 Cyber (2.8× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Claude Opus 4.8 has an ECI of 158.3 and GPT-5.6 Cyber has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Opus 4.8 and GPT-5.6 Cyber yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Claude Opus 4.8 has the largest context window at 1,000,000 tokens, against 400,000 for GPT-5.6 Cyber. Maximum output per response: Claude Opus 4.8 up to 128,000, GPT-5.6 Cyber up to 128,000 tokens.
Which can read images, PDFs, audio or video?
Claude Opus 4.8 accepts text, images and PDFs; GPT-5.6 Cyber accepts text and images. Claude Opus 4.8 handles the widest range of inputs.
Are any of these open source?
No. Claude Opus 4.8 and GPT-5.6 Cyber are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.6 Cyber is the newest, released Aug 7, 2026. Claude Opus 4.8 came out May 28, 2026. Knowledge cutoff: Claude Opus 4.8 Jan 2026, GPT-5.6 Cyber Feb 16, 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 Oct 4, 2026.
